The blog postings are about the Singapore Math. The readers can learn from the postings on Solving Singapore Primary School Mathematics. The blog presenting the Math Concept, Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids will learn the skills of dealing with Math Question Solving, Math Modeling and Problem Sums from Lower Primary School to Upper Primary School level after reading the blog postings. This posting is an upper primary school math question on Ratio and Problem Sum.

You can read the postings on **Sarin learns concept of ratio in school** to understand the concept of Ratio.

*Challenge yourself with the question before look out for the given solution‼!*

**Upper primary school mathematics question UPQ334**

Sarin, Hairu and Fatimah had some stickers. The ratio of the number of stickers Sarin had to the number of stickers Fatimah had was 3 : 5. Sarin and Fatimah together had three times as many stickers as Hairu. The difference in the number of stickers that Hairu and Fatimah had was 987. How many stickers did Sarin have?

Solution:

Sarin and Fatimah stickers is 3 times of Hairu’s stickers

The ratio of Sarin’s stickers to Fatimah’s stickers = 3 : 5

Normalise the model and redraw

From the model

24 units – 8 units – 9units = 987

7 units = 987

1 unit = 141 stickers

The number of stickers that Sarin had = 9 × 141 = 1269

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