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primary 5 | Maths | Fractions
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Merlion
Merlion

primary 5 chevron_right Maths chevron_right Fractions chevron_right Singapore

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Date Posted: 1 month ago
Views: 38

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2/5 = 0.4
2/6 = 0.333.....
3/7 = 0.428571....
3/8 = 0.375

1/2 = 0.5
Therefore answer is 3.
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Janice
Janice's answer
21 answers (A Helpful Person)
1st
2/5 = 4/10, 1/2 = 5/10
Difference = 5/10 - 4/10 = 1/10

2/6 no need to change. 1/2 = 3/6
Difference = 3/6 - 2/6 = 1/6

3/7 = 6/14, 1/2 = 7/14
Difference = 7/14 - 6/14 = 1/14

3/8 no need to change. 1/2 = 4/8
Difference = 4/8 - 3/8 = 1/8

We can clearly see that the smallest difference is 1/14 , so 3/7 is closest to 1/2.
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J
J's answer
990 answers (A Helpful Person)
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LH
Lh's answer
45 answers (A Helpful Person)
Practise on comparing fractions! :)
J
J
1 month ago
Disadvantage to this method :

If the denominators of two fractions are equally close to the fraction in question, the student may be confused as to which to pick.

Eg.

Which of the following fractions is closest to 3/7?

(1) 2/6
(2) 3/8
(3) 1/2
(4) 3/5


In this case,

2/6 = 6/18
3/8 = 6/16
1/2 = 6/12
3/5 = 6/10

And 3/7 = 6/14

Both 16 and 12 are 2 away from 14.
So the student might not if 3/8 (= 6/16) or 1/2 (= 6/12) is to be picked.

A common error would be to pick 1/2 (= 6/12) just because of the thinking that 12 is smaller than 14
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HiderApplecross
Hiderapplecross's answer
802 answers (Tutor Details)
Hi, I provide 1 to 1 online tutoring through ZOOM. $50/1.5h. You may contact me via WhatsApp at 9033 8810. I am an ex-school teacher :)