The blog postings are about the Singapore Math. The readers can learn from the postings about 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 can learn the skills of dealing with the Math Modeling, the Math problem solving and the Problem Sum from Lower Primary School to Upper Primary School level after reading the blog postings. This posting is an upperprimary school math question on Problem Solving.

You can read the posting on **Sarin and his coin bank** for the story of coin bank.

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

**Upper primary school mathematics question UPQ473**

Sarin and Hairu have some coins in their coin banks. If Sarin gives 45 coins to Hairu, both of them will have and equal amount of coins. If Hairu gives 45 coins to Sarin, Sarin will have thrice as many coins as Hairu. How many coins does Hairu have?

Solution:

Start with Sarin given 45 coins to Hairu and both have equal amount of coins, then Sarin is 3 times of Hairun if Hairu gives 45 coins to Sarin

The amount transfer is constant = 45 coins

Each yellow blocks in the model is 45 coins

Per the model

1 unit = 2 × 45 = 90

The number of coins that Hairu has = 90 + 45 = 135

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