tag:blogger.com,1999:blog-7712974503564543793.post6863170113812476081..comments2023-03-28T17:50:10.401+08:00Comments on 2013 S1-04 Maths Blog: ERROR ANALYSIS - NUMBERSAliff Qayyumhttp://www.blogger.com/profile/04337758997612587119noreply@blogger.comBlogger18125tag:blogger.com,1999:blog-7712974503564543793.post-87157537639909587682013-02-18T22:14:30.871+08:002013-02-18T22:14:30.871+08:001) Diagnostic Test 2 Q 4 (c)
QD:
Nature of errors:...1) Diagnostic Test 2 Q 4 (c)<br />QD:<br />Nature of errors: Careless<br />Error:<br />Line 1: (11-9)=2.<br />Line 2: -1/2 x -1/2 is 1/4<br /><br />2) Diagnostic Test 2 Q 4 (c)<br />QE:<br />Nature of errors: Careless<br />Error:<br />Line 1: (11-9)=2, <br /><br />3) Diagnostic Test 2 Q4 (c)<br />QF<br />Nature of errors: Conceptual<br />Error:<br />Line 1: 16 x (-1/2)^2 = 4,<br /><br />4) Diagnostic Test 2 Q4 (d)<br />QA<br />Nature of errors: Careless<br />Error:<br />Line 2: the denominator 2/12 in line 1 =1/6<br /><br />5) Diagnostic Test 2 Q4 (d)<br />QB<br />Nature of errors: Conceptual<br />Error:<br />Lines 2&3: -1/2/1/6 = -1/2 x 6=3<br /><br />6)Diagnostic Test 2 Q4 (D)<br />QC<br />Nature of errors: Careless<br />error:<br />Line 1: 1/2-1=-1/2<br /><br />7)Diagnostic Test 2 Q4 (d)<br />QD<br />Nature of errors: Conceptual<br />Error:<br />Line 4 - ½ should not be flipped, ⅙ should.<br /><br />8)Diagnostic Test 2 Q4 (d)<br />QE <br />Nature of error: Conceptual <br />Error: <br />Line 1 2/3 x 1/4 = 2/12, not 2/3 / 4/1<br />Line 2 2/3 / 4/1 = 2/12, not 0.5/3Ng Wei Han Ryan(黄威翰18)https://www.blogger.com/profile/16197283342125043868noreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-46432504418668692092013-02-17T16:51:48.860+08:002013-02-17T16:51:48.860+08:00Diagnostic Test 2 Q 4(c)
QA
Nature of errors: Conc...Diagnostic Test 2 Q 4(c)<br />QA<br />Nature of errors: Conceptual<br />Line 1: 2x2-16(1/4) not (-1/4)<br /><br />Diagnostic Test 2 Q 4(c)<br />QB<br />Nature of errors: Conceptual<br />Line 3: -16(-1/2)=+8 not -8<br /><br />Diagnostic Test 2 Q 4(c)<br />QC<br />Nature of errors: Careless<br />Line 2: -16(-1/2)^2= -16x0.25 not 2.5<br /><br />Diagnostic Test 2 Q 4(c)<br />QD<br />Nature of errors: Careless<br />Line 1: 2(11-9)=2x2 not 2x3<br /><br />Diagnostic Test 2 Q 4(c)<br />QE<br />Nature of errors: Conceptual<br />Line 1: (1/2)^2=0.25 not -0.25<br /><br />Diagnostic Test 2 Q 4(c)<br />QF<br />Nature of errors: Conceptual<br />Line 1: -16(-1/2)^2=-16(0.25) not (16x-1/2^2)<br /><br />Diagnostic Test 2 Q 4(d)<br />QA<br />Nature of errors: Careless<br />Line 2: (-1/2)/(2/12)= (-1/2)/(1/6) not (-1/2)/6<br /><br />Diagnostic Test 2 Q 4(d)<br />QB<br />Nature of errors: Careless<br />Line 3: (-1/2)/ (1/6)= -3 not -1/3<br /><br />Diagnostic Test 2 Q 4(d)<br />QC<br />Nature of errors: Careless<br />Line 1:(1/2)-1/(2/3 x1/4) = -1/2/(1/6) not (-1(1/2)/(11/12)<br /><br />Diagnostic Test 2 Q 4(d)<br />QD<br />Nature of errors: Careless<br />Line 1: 2/3=2/3 not 1/3 and 1/4=1/4 not 1/2<br />Nature of errors: Conceptual<br />Line 4: 1/6 should be switched not 1/2<br /><br />Diagnostic Test 2 Q 4(d)<br />QE<br />Nature of errors: Conceptual<br />Line 3 : (0.5)/(0.5/3)=3 not1/3Lee Xu Zhou Bryanhttps://www.blogger.com/profile/18025528591642214479noreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-38524819593880358302013-02-17T15:43:24.715+08:002013-02-17T15:43:24.715+08:00Diagnostic test 2 Q4(c)
QA
Nature of error:concept...Diagnostic test 2 Q4(c)<br />QA<br />Nature of error:conceptual<br />Line 1 (-1/2)^2=1/4 not -1/4<br />Nature of error:careless and conceptual<br />Line4 -12x(-1/4)=3 not-120<br /><br />Diagnostic test 2 Q 4(c)<br />Nature of error<br />QB<br />Nature of errors:conceptual<br />Line 2:16x (-1/2)=-8 not 8<br /><br />Diagnostic test 2 Q 4(c)<br />QC<br />Nature of errors:careless<br />Line2 (-1/2)^2=1/4 not 2.5<br /> <br />Diagnostic test 2 Q 4(c)<br />QD<br />Nature of error:careless<br />Line1 11-9=2 not 3<br />Nature of error:conceptual<br />-1/2 x -1/2=1/4 not -1<br /><br />Diagnostic test 2 Q 4(c)<br />QE<br />Nature of error:careless and conceptual, according to order<br />Line1 2=2 not 22, 11-9=2 not18<br /><br />Diagnostic test 2 Q 4(c)<br />QF<br />Nature of error: conceptual<br />Line1 16(-1/2)^2 =(-8)^2 not [16x-1/2]^2<br />Line3 (-8)^2=64 not-64<br /><br />Diagnostic test 2 Q 4(d)<br />QA<br />Nature of error:conceptual<br />Line2 2/12 = 2/6 not 6<br /><br />Diagnostic test 2 Q 4(d)<br />QB<br />Nature of error:conceptual<br />Line3 -(1/2)/(1/3)=-3 not -1/3<br /><br />Diagnostic test 2 Q 4(d)<br />QC<br />Nature of error:careless<br />Line 1 (1/2 -1)/[(2/3)x(1/40]=(-1/2)/(1/6) not (-1 (1/2))/(11/12)<br /><br />Diagnostic test 2 Q 4(d)<br />QD<br />Nature of error:careless<br />Line1 2/3=2/3 not 1/3 and 1/4=1/4 not/1/2<br />Nature of error:conceptual <br />Line 4 1/6 should be switched not 1/2<br /><br />Diagnostic test 2 Q 4(d)<br />QE<br />Nature of errors:conceptual<br /> Line 3 (0.5)/(0.5/3)=3 not-1/3Tan Hong Yi (陈 泓 毅)https://www.blogger.com/profile/02359569074251889671noreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-64847867291863980642013-02-17T12:31:18.200+08:002013-02-17T12:31:18.200+08:001) Diagnostic Test 2 Q 4 (c)
QD:
Nature of errors:...1) Diagnostic Test 2 Q 4 (c)<br />QD:<br />Nature of errors: Careless and conceptual (accordingly)<br />Error:<br />Line 1 11-9 equals to 2, <br />Line 2 -1/2 multiply by -1/2 is 1/4<br /><br />2) Diagnostic Test 2 Q 4 (c)<br />QE:<br />Nature of errors: Careless<br />Error:<br />Line 1: (11-9)=2, not 18; (-1/2)^2 = +0.25 or +1/4<br /><br />Diagnostic Test 2 Q4(c)<br />QF<br />Nature of errors: Conceptual<br />Error<br />Line 1: 16(-(1/2))^2=16(0.25)=4<br /><br />Diagnostic Test 2 Q4(d)<br />QA<br />Nature of errors: Careless<br />Error:<br />Line 2: 2/12=1/6<br /><br />5) Diagnostic Test 2 Q4 (d)<br />QB<br />Nature of errors: Conceptual<br />Error:<br />Lines 2&3: -1/2/1/6 = -1/2 x 6=3, not 1/3<br /><br />Diagnostic Test 2 Q4 (D)<br />QC<br />Nature of errors: Careless<br />error:<br />Line 1: 1/2-1=-1/2 not- 1 and 1/2<br /><br />Diagnostic Test 2 Q4 (d)<br />QD<br />Nature of errors: Conceptual<br />Error:<br />Line 4 - ½ should not be flipped, ⅙ should.<br /><br />Diagnostic Test 2 Q4 (d)<br />QE <br />Nature of error: Conceptual <br />Error: <br />Line 1 2/3 x 1/4 = 2/12, not 2/3 / 4/1<br />Line 2 2/3 / 4/1 = 2/12, not 0.5/3Chow Yu Hin (赵悦曦)https://www.blogger.com/profile/01779306348972767552noreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-10267938584823119972013-02-16T21:28:20.535+08:002013-02-16T21:28:20.535+08:00Diagnostic Test 2 Q 4 (c)
QD
Nature of errors: Ca...Diagnostic Test 2 Q 4 (c)<br />QD<br />Nature of errors: Careless<br />Error: <br />Line 1 11-9 = 2, not 3 <br /> -½ x -½ = ¼ , not -1.<br /><br />Diagnostic Test 2 Q 4 (c)<br />QE<br />Nature of errors: Conceptual and Careless<br />Error: <br />Line 1 (-½ ) x (-½ ) = 0.25, not -0.25 <br /> 2(11-9) = 4<br /><br />Diagnostic Test 2 Q 4 (c)<br />QF<br />Nature of errors: Careless<br />Error<br />Line 1 2(11-9) = 4 <br /> 16(-½) ^2 is not equal to (16 x -½ )^2<br /><br />Diagnostic Test 2 Q 4 (d)<br />QA<br />Nature of errors: Careless<br />Error:<br />Line 2 2/12 = ⅙ , not 6<br /><br />Diagnostic Test 2 Q 4 (d)<br />QB <br />Nature of errors: Conceptual<br />Error:<br />Line 3 -½ / ⅙ = -3, not ⅓ <br /><br />Diagnostic Test 2 Q 4 (d)<br />QC<br />Nature of errors: Conceptual<br />Error:<br />Line 1 1/2 - 1 = -½, not -1½ . 2/3 x ¼ = ⅙ , not 11/12 <br /><br />Diagnostic Test 2 Q 4 (d)<br />QD<br />Nature of errors: Conceptual<br />Error:<br />Line 4 - ½ should not be flipped, ⅙ should.<br /><br />Diagnostic Test 2 Q 4 (d)<br />QE<br />Nature of errors: Conceptual<br />Error:<br />Line 1 To multiply a fraction, the 2nd fraction should not be flipped and the multiplication operation (x) should not be turned into a division operation (/). In this case, ¼ should not be flipped.Khairul Aizat Bin Md Halimhttps://www.blogger.com/profile/14212820174947599582noreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-44015467794598825292013-02-16T16:30:22.436+08:002013-02-16T16:30:22.436+08:00Diagnostic Test 2 Q 4 (c)
QD
nature of error: care...Diagnostic Test 2 Q 4 (c)<br />QD<br />nature of error: careless<br />error:<br />line 1, 2(11-9) equals 2x2 not 2x3.<br />line 2 -1/2x-1/2 equals 1/4 not -1.<br /><br />diagnostic test 2 Q 4 (c)<br />QE<br />nature of error: conceptual <br />line 1 he thought that 2(11-9) equals 2x11 - 2x9.<br /><br /><br />Diagnostic test 2 Q (c) <br />QF <br />nature of error: conceptual<br />line 1 he thought 2(11-9) equals multiplying both numbers in the brackets by 2 then minus them. and also 16x(-1/2)^2 does not equal (16x -1/2)^2.<br /><br /> diagnostic test 2 Q (d)<br />QA<br />nature of error: conceptual<br />line 2 1/12 equals 1/6 not 6.<br /><br />diagnostic test @ Q (d)<br />QB<br />nature of error: conceptual<br />line 3 1/2 divided by 1/6 equals 3 not 1/3.<br /><br />diagnostic test Q (d)<br />QC<br />nature of error: conceptual<br />line 1, he just added -1 to 1/2 instead of substracting 1 from 1/2<br />nature of error: careless<br />line 1 he got 11/12 from 1/2x2/3. it is actually 1/12.<br />line 4 the answer is actually 18/11 not 7/12<br /><br />diagnostic test Q (d) <br />QD<br />nature of error: conceptual<br />line 1 he he divided 2/3 by 2 and multiplied 1/4 by 2.<br /><br />Mohamad Taufiq Bin Mohamad Rozainihttps://www.blogger.com/profile/07693350986921656552noreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-56359117638669653362013-02-16T16:00:22.671+08:002013-02-16T16:00:22.671+08:00Diagnostic Test Q4(c)
QD
Nature of error: Carele...Diagnostic Test Q4(c)<br />QD <br />Nature of error: Careless(line 1) and Conceptual(Line 2)<br />Error: Line 1 (Careless) 11- 9=2 <br /> Line 1 (conceptual) Negative x Negative = Positive. And 1/2 x 1/2 = 1/4<br /><br />QE <br />Nature of error: Conceptual<br />Error: Line 1 Negative x Negative = Positive (- 1/2 x -1/2 = 1/4 or 0.25)<br /><br /> QF <br />Nature of Error: Conceptual<br />Error: Line 1 16(-1/2 x -1/2) is not (16 x -1/2) x (16 x -1/2) <br /><br />Diagnostic Test Q4(d)<br />QA <br />Nature of error: Careless<br />Error: Line 2 2/3 x 1/4 = 1/6 not 6<br /><br />QB <br />Nature of error: Conceptual<br />Error: Line 3 - 1/2 divided by 1/6 = -3 not - 1/3<br /><br />QC <br />Nature of error: Careless <br /> Error: Line 1 1/2 - 1 should be -1/2. 2/3 x 1/4 should be 1/6 (He/she did addition)<br /><br />QD <br />Nature of error: Conceptual<br />Error: Line 4 -1/2 should not be flipped. Only the second fraction should be flipped when changing division to multiplication. <br /><br />QE <br />Nature of error: Conceptual <br />Error: Line 1 2/3 x 1/4 = 2/12, not 2/3 / 4/1<br /> Line 2 2/3 / 4/1 = 2/12, not 0.5/3Tan Su Wen Kimberly(陈素文)https://www.blogger.com/profile/04484466366121944121noreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-52253053008706480852013-02-16T15:58:09.350+08:002013-02-16T15:58:09.350+08:00Diagnostic Test Q4(c)
QD
Nature of error: Carele...Diagnostic Test Q4(c)<br />QD <br />Nature of error: Careless(line 1) and Conceptual Error(Line 2)<br />Error: Line 1 (Careless) 11- 9=2 <br /> Line 1 (conceptual) Negative x Negative = Positive. And 1/2 x 1/2 = 1/4<br /><br />QE <br />Nature of error: Conceptual Error<br />Error: Line 1 Negative x Negative = Positive (- 1/2 x -1/2 = 1/4 or 0.25)<br /><br /> QF <br />Nature of error: Conceptual Error<br />Error: Line 1 16(-1/2 x -1/2) is not (16 x -1/2) x (16 x -1/2) <br /><br />Diagnostic Test Q4(d)<br />QA <br />Nature of error: Careless Error <br />Error: Line 2 2/3 x 1/4 = 1/6 not 6<br /><br />QB <br />Nature of error: Conceptual Error <br />Error: Line 3 - 1/2 divided by 1/6 = -3 not - 1/3<br /><br />QC <br />Nature of error: Careless Error<br /> Error: Line 1 1/2 - 1 should be -1/2. 2/3 x 1/4 should be 1/6 (He/she did addition)<br /><br />QD <br />Nature of error: Conceptual Error <br />Error: Line 4 -1/2 should not be flipped. Only the second fraction should be flipped when changing division to multiplication. <br /><br />QE <br />Nature of error: Conceptual Error<br />Error: Line 1 2/3 x 1/4 = 2/12, not 2/3 / 4/1<br /> Line 2 2/3 / 4/1 = 2/12, not 0.5/3Tan Su Wen Kimberly(陈素文)https://www.blogger.com/profile/04484466366121944121noreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-33647465242273703672013-02-16T15:34:15.094+08:002013-02-16T15:34:15.094+08:00Diagnostic Test 2 Q4 (C)
QD
Nature of errors:Carel...Diagnostic Test 2 Q4 (C)<br />QD<br />Nature of errors:Careless<br />Error:<br />Line 1: 11-9=2 <br />Line 2: -1/2 x -1/2=1/4<br /><br />Diagnostic Test 2 Q4 (C)<br />QE<br />Error:conceptual<br />Error:<br />Line 1: -1/2 x -1/2 = 1/4 not-1/4<br /><br />Diagnostic Test 2 Q4 (C)<br />QF<br />Nature of errors: Conceptual<br />Error:<br />Line 1: 16(1/2)^2=4 not -8^2<br /><br />Diagnostic Test 2 Q4 (D)<br />QA <br />Nature of errors: Careless<br />Line 2: 2/12=1/6<br /><br />Diagnostic Test 2 Q 4 (D)<br />QB<br />Nature of errors: Conceptual<br />Error:<br />Line 2&3: 1/2 /1/6 =-3 not -1/3<br /><br />Diagnostic Test 2 Q4 (D)<br />QC<br />Nature of errors: Careless<br />error:<br />Line 1: 1/2-1=-1/2 not- 1 and 1/2<br /><br />Diagnostic Test 2 Q4 (D)<br />QD<br />Nature of errors: Conceptual<br />Error:<br />Line 4: when doing the multiplication the latter fraction is the one that should be inverted.<br /><br />Diagnostic Test 2 Q4 (D)<br />QE<br />Nature of errors: Conceptual<br />Error:<br />Line 1: 2/3 x 1/4 cannot be changed to 2/3 / 4/1Aliff Qayyumhttps://www.blogger.com/profile/04337758997612587119noreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-91629573877728517502013-02-16T13:57:03.910+08:002013-02-16T13:57:03.910+08:001) Diagnostic Test 2 Q4 (c)
QD
Nature of errors: C...1) Diagnostic Test 2 Q4 (c)<br />QD<br />Nature of errors: Careless<br />Error:<br />Line 1: (11-9) =2, not 3<br />Line 2: -1/2 x -1/2 is +1/4 as negative x negative = positive<br /><br />2) Diagnostic Test 2 Q4 (c)<br />QE<br />Nature of errors: Conceptual<br />Error:<br />Line 1: -1/2 x -1/2 = +0.25 or +1/4 to negative<br /><br />3) Diagnostic Test 2 Q4 (c)<br />QF<br />Nature of errors: Conceptual<br />Error:<br />Line 1: 16 x (-1/2)^2 = 4, not -8^2<br /><br />4) Diagnostic Test 2 Q4 (d)<br />QA<br />Nature of errors: Careless<br />Error:<br />Line 2: the denominator 2/12 in line 1 =1/6, not 6<br /><br />5) Diagnostic Test 2 Q4 (d)<br />QB<br />Nature of errors: Conceptual<br />Error:<br />Lines 2&3: -1/2/1/6 = -1/2 x 6=3, not 1/3<br /><br />6) Diagnostic Test 2 Q4 (d)<br />QC<br />Nature of errors: Careless<br />Error:<br />Line 1: -1/2 - 1= 1/2, not -1 1/2; 2/3 x 1/4 = 2/12 or 1/6<br /><br />7) Diagnostic Test 2 Q4 (d)<br />QD<br />Nature of errors: Conceptual<br />Error:<br />Line 4: When doing the inverted multiplication, the second fraction should be the one that is inverted, not the first. So it's (-1/2) x (6/1)<br /><br />8) Diagnostic Test 2 Q4 (d)<br />QE<br />Nature of errors: Conceptual<br />Error:<br />Line 1: 2/3 x 1/4 cannot be inverted to division as it does not work that way. So it is 2/12, not 2/3 / 4/1Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-63332778113478433932013-02-16T11:27:33.990+08:002013-02-16T11:27:33.990+08:00Diagnostic Test 2 Q 4 (c)
QD
Nature of errors: Ca...Diagnostic Test 2 Q 4 (c)<br />QD<br />Nature of errors: Careless<br />Error:<br />Line 1 2(11-9) = 2x2<br />Line 2 (-1/2)(-1/2) = 1/4<br /><br />Diagnostic Test 2 Q 4 (c)<br />QE<br />Nature of errors: Conceptual<br />Error:<br />Line 1 (1/2)^2 = 0.25<br /><br />Diagnostic Test 2 Q 4 (c)<br />QF<br />Nature of errors: Conceptual<br />Error:<br />Line 1 16(1/2)^2 = 16 x (1/2)^2 = 16 x 1/4 = 4<br /><br /><br />Diagnostic Test 2 Q4(d)<br />QA<br />Nature of errors: Careless<br />Error:<br />Line 2: 2/12=1/6<br /><br />Diagnostic Test 2 Q4(d)<br />QB<br />Nature of errors: Conceptual<br />Error:<br />Line 3 -1/2 / 1/6 = -1/2 x 6/1 = -3<br /><br />Diagnostic Test 2 Q4(d)<br />QC<br />Nature of errors: Careless<br />Error:<br />Line 1 1/2 - 1 = 1/2<br />Line 1 2/3 x 1/4 = 2/12<br /><br />Diagnostic Test 2 Q4(d)<br />QD<br />Nature of errors: Conceptual<br />Error:<br />(-1/2) / 1/6 = -1/2 x 6/1<br /><br />Diagnostic Test 2 Q4(d)<br />QE<br />Nature of errors: Conceptual<br />Error:<br />Line 1 2/3 x 1/4 does not need to be changedHeng Yee Ying Beverly (王奕縈)https://www.blogger.com/profile/16878633746332371258noreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-33521664875255992862013-02-16T08:50:34.593+08:002013-02-16T08:50:34.593+08:00Sorry for replying as a photo as i could not use m...Sorry for replying as a photo as i could not use my LD yesterday so i wrote it down and uploaded it as a picture <br />http://postimage.org/image/z4r8u1r3l/ (overview)<br />http://postimage.org/image/tvw7w68oh/ (Question 1 )<br />http://postimage.org/image/4xu44sz3z/ (Question 2 ) sean https://www.blogger.com/profile/02738382961453799649noreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-49091085997047138112013-02-15T21:48:21.488+08:002013-02-15T21:48:21.488+08:00Diagnostic Test 2 Q4(c)
QD
Nature of errors: Conce...Diagnostic Test 2 Q4(c)<br />QD<br />Nature of errors: Conceptual<br />Error<br />Line 1:(-(1/2)x(-(1/2))=1/4<br /><br />Diagnostic Test 2 Q4(c)<br />QE<br />Nature of errors: Conceptual<br />Error<br />Line 1: (-(1/2)^2)=0.25<br /><br />Diagnostic Test 2 Q4(c)<br />QF<br />Nature of errors: Conceptual<br />Error<br />Line 1: 16(-(1/2))^2=16(0.25)=4<br /><br />__________________________________________________<br /><br />Diagnostic Test 2 Q4(d)<br />QA<br />Nature of errors: Careless<br />Error<br />Line 2: 2/12=1/6<br /><br />Diagnostic Test 2 Q4(d)<br />QB<br />Nature of errors: Careless<br />Error<br />Line 2:-(1/2)/(1/6)=-(1/2)x6=3<br /><br />Diagnostic Test 2 Q4(d)<br />QC<br />Nature of errors: Careless<br />Error<br />Line 1: (1/2)-1=-(1/2)<br /><br />Diagnostic Test 2 Q4(d)<br />QD<br />Nature of errors: Conceptual<br />Error<br />Line 3: (-(1/2))/(1/6)=(-(1/2))x(6/1)=3<br /><br />Diagnostic Test 2 Q4(d)<br />QE<br />Nature of errors: <br />Error<br />Line 2: (2/3)/(4/1)=(2/3)x(1/4)=1/6<br /><br />Pls tell me if there are errors I'll correct them :)Tan Yi Cong Kenric (陈奕璁)https://www.blogger.com/profile/14230124258514091581noreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-49862159314124897682013-02-15T21:47:13.754+08:002013-02-15T21:47:13.754+08:001) Diagnostic Test 2 Q 4 (c)
QD:
Nature of errors:...1) Diagnostic Test 2 Q 4 (c)<br />QD:<br />Nature of errors: Careless<br />Error:<br />Line 1: (11-9)=2, not 3 <br />Line 2: -1/2 x -1/2 is +1/4<br /><br />2) Diagnostic Test 2 Q 4 (c)<br />QE:<br />Nature of errors: Careless<br />Error:<br />Line 1: (11-9)=2, not 18; (-1/2)^2 = +0.25 or +1/4<br /><br />3) Diagnostic Test 2 Q 4 (c)<br />QF:<br />Nature of errors: Conceptual then careless <br />Error:<br />Line 1: Always do the sums in the brackets first; <br />2(11-9)=2(2)<br /> =4; <br />-16(-1/2)^2=-16(1/4)<br /> =-4 <br />Lines 2&3: (-8)^2 = +64<br /><br />4) Diagnostic Test 2 Q 4 (d)<br />QA:<br />Nature of errors: Careless<br />Error:<br />Line 2: 2/12=1/6, not 6<br /><br />5) Diagnostic Test 2 Q 4 (d)<br />QB:<br />Nature of errors: Conceptual<br />Lines 2&3: -1/2 / 1/6=-1/2 x 6<br /> =6/2<br /> =3<br /><br />6) Diagnostic Test 2 Q 4 (d)<br />QC:<br />Nature of errors: Careless<br />Error:<br />Line 1: 1/2-1=-1/2, not -1 1/2<br />2/3 x 1/4=2/12, not 11/12<br />Lines 3&4: -18/12 / 11/12=-18/12 x 12/11<br /> =-18/11<br /> =-1 7/11<br /><br />7) Diagnostic Test 2 Q 4 (d)<br />QD:<br />Nature of errors: Careless then Conceptual<br />Error:<br />Line 1: 2/3 x 1/4 is not 1/3 x 1/2<br />Line 4: (-1/2) / 1/6=-1/2 x 6<br /> =-6/2<br /> =-3<br /><br />8) Diagnostic Test 2 Q 4 (d)<br />QE:<br />Nature of errors: Conceptual<br />Error:<br />Line 1: 2/3 x 1/4 = 2/12, not 2/3 / 4/1<br />Line 2: 2/3 / 4/1 = 2/12, not 0.5/3<br /> <br /><br /><br /> <br /><br /><br />Tan Yun Ting Lynette (陈筠婷09)https://www.blogger.com/profile/16405616850093539033noreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-21073060909838293162013-02-15T21:41:47.090+08:002013-02-15T21:41:47.090+08:00ohohMohamad Taufiq Bin Mohamad Rozainihttps://www.blogger.com/profile/07693350986921656552noreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-70275592036666332212013-02-15T21:10:06.552+08:002013-02-15T21:10:06.552+08:00u have to do all, taufiq :)u have to do all, taufiq :)Tan Yi Cong Kenric (陈奕璁)https://www.blogger.com/profile/14230124258514091581noreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-3868391825778259202013-02-15T18:39:42.355+08:002013-02-15T18:39:42.355+08:00wait, nehal i thought only supposed to find one er...wait, nehal i thought only supposed to find one error each? nevermind.<br />Diagnostic Test 2 Q 4 (c)<br />QD<br />nature of error: careless<br />error:<br />line 1, 2(11-9) equals 2x2 not 2x3.<br />line 2 -1/2x-1/2 equals 1/4 not -1.Mohamad Taufiq Bin Mohamad Rozainihttps://www.blogger.com/profile/07693350986921656552noreply@blogger.comtag:blogger.com,1999:blog-7712974503564543793.post-17075189533545676922013-02-15T17:54:37.161+08:002013-02-15T17:54:37.161+08:001) Diagnostic Test 2 Q 4 (c)
QD:
Nature of errors:...1) Diagnostic Test 2 Q 4 (c)<br />QD:<br />Nature of errors: Careless and conceptual (accordingly)<br />Error:<br />Line 1 11-9 equals to 2, <br />Line 2 -1/2 multiply by -1/2 is 1/4<br /><br />2) Diagnostic Test 2 Q 4 (c)<br />QE: <br />Nature of errors: Conceptual<br />Error:<br />Line 1 -1/2 x -1/2 is 0.25, or 1/4<br /><br />3) Diagnostic Test 2 Q 4 (c)<br />QF:<br />Nature of errors: Conceptual<br />Error:<br />Line 1 16(-1/2 x -1/2) does not equal to (16 x -1/2) x (16 x -1/2)<br /><br />4) Diagnostic Test 2 Q 4 (d)<br />QA:<br />Nature of errors: Careless<br />Error:<br />Line 2 2/12 does not equal to 6. It should be 1/6 instead.<br /><br />5) Diagnostic Test 2 Q 4 (d)<br />QB:<br />Nature of errors: Conceptual<br />Error: <br />Line 2 1/2 divide by 1/6 does not equal to -1/3. We should change the sign divide to multiplication, and therefore, changing the 1/6 to 6/1. Then, it would be easier to find the answer.<br /><br />6) Diagnostic Test 2 Q 4 (d)<br />QC:<br />Nature of errors: Careless<br />Error:<br />Line 1 Firstly, 1/2 - 1 should be -1/2. Secondly, 2/3 x 1/4 should be 1/6.<br /><br />7) Diagnostic Test 2 Q 4 (d)<br />QD:<br />Nature of errors: Conceptual<br />Error:<br />Line 4 The -1/2 should not be flipped when the division sign was being changed to multiplication. Only the second fraction should be flipped.<br /><br />8) Diagnostic Test 2 Q 4 (d)<br />QE:<br />Nature of errors: Conceptual<br />Error:<br />Line 1 There is no need for the operation to be changed. We can solve the equation 2/3 x 1/4 just like that, without requiring the need to change the operation to division. If you change it to division, you will need to change it back to multiplication to solve it.Nehal Janakrajhttps://www.blogger.com/profile/00223088548889327408noreply@blogger.com