The blog postings are about the Singapore Math. The readers can learn from the postings on Solving Singapore Primary School Mathematics. You or your kids can learn dealing with Math modeling, Problem Sum from Lower Primary School to Upper Primary School level in Singapore school. This posting is a primary school math question on Ratio, Fraction and Math Modeling.

You can click and read the postings on **Sarin learns concept of ratio in school** and **Sarin learns the concept of Fraction (mathematics concept)** to understand Ratio and Fraction.

Upper primary school mathematics question UPQ194

5/7 of Hairu’s stickers is the same as 1/6 of Sarin’s stickers. Fatimah has half as much stickers as Sarin. What is the ratio of Sarin’s stickers to Hairu’s stickers to Fatimah’s stickers?

Solution:

We can work out the ratio by drawing the model based on the stickers each of them have

5/7 fraction of Hairu’s stickers is 1/6 of Sarin’s stickers.

Total Stickers for Sarin is 6 × 5 = 30 units

Since Fatimah has half as much stickers as Sarin

The number of stickers in units for Fatimah = 30 ÷ 2 = 15 units

The model as below shown.

The ratio of Sarin’s stickers to Hairu’s stickers to Lionel’s stickers = 30 : 7 : 15

Alternative solution:

5/7 fraction of stickers of Hairu ==> 1/6 = 5/30 fraction of stickers of Sarin

The ratio of Hairu’s stickers to Sarin’s stickers = 7 : 30

Fatimah has half as much sticker as Sarin

The ratio of Fatimah’s sticker to Sarin’s stickers = 1 : 2 = 15 : 30

The ratio of Sarin’s stickers to Hairu’s stickers to Fatimah’s stickers = 30 : 7 : 15

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