The blog postings are about the Singapore Math. The readers can learn from the postings on Solving Singapore Primary School Mathematics. The blog presents 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.

Read the posting 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 UPQ389**

Fatimah had 112 stickers. Fatimah gave away 16 stickers and the ratio of the number of stickers she had to Hairu’s is 3 : 2.

(a) How many stickers did Hairu have at first?

(b) If Fatimah had given the 16 stickers to Hairu instead, what is the ratio of the number of stickers she had to the number of stickers that Hairu had in the end?

Solution:

After Fatimah gave away 16 stickers, the stickers ratio she had to Hairu’s = 3 : 2

Draw the model with ratio 3 : 2 and add in information of stickers Fatimah had and give away.

From the model

3 units = 112 – 16 = 96

1 unit = 32

The number of stickers that Hairu had = 2 × 32 = 64

If Hairu receive 16 stickers from Fatimah

The number of stickers that Hairu had = 64 + 16 = 80

The number of stickers that Fatimah had = 112 – 16 = 96

The ratio of the number of stickers Fatimah had to the number of stickers that Hairu had in the end = 96 : 80 = 6 : 5

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