sstrike's answer to O help's Primary 6 Maths Ratio Singapore question.

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sstrike
Sstrike's answer
5566 answers (A Helpful Person)
1st
Try ratio
O help
O Help
8 months ago
May I know why x4 to both the 70% and 30%?
sstrike
Sstrike
8 months ago
75%=¾
Denominator is 4
So ×4 to ensure we can work with whole number
70%:30%
=7:3
7÷4=decimal
Can understand?
O help
O Help
8 months ago
Yup, understand this.

But how to know whether the foreign student denominator of 3 (2/3 and 1/3) will also be able to divide?

Thanks
sstrike
Sstrike
8 months ago
If 7×4
Must 3×4=12 too
12 is a multiple of denominator 3, again work with the whole number
O help
O Help
8 months ago
Thanks!
sstrike
Sstrike
8 months ago
supposed scl tr sld teach all this concept?