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

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**Upper primary school mathematics question UPQ447**

Hairu had 140 stickers more than Fatimah. If Hairu gave Fatimah 20 stickers, he would have three times as many stickers as Fatimah. How many stickers did Hairu have at first?

Solution:

Draw the model

Hairu given 20 stickers and he has 3 time as many stickers as Fatimah

Per the model

2 units = 140 – 20 – 20 = 100

1 unit = 50 stickers

The number of stickers that Hairu has at first = 3 × 50 + 20 = 170

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