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

Read the posting on **Fatimah and Hairu play Congkak** to know about Congkak game.

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

Upper primary school mathematics question UPQ168

During a CongKak game, 3/5 of the beads in the big cavity are red beads. The rest are yellow beads. There are 45 fewer yellow beads than red beads. How many beads are there in the big cavity?

* *Solution:

Base on Fraction,

3/5 fraction of the beads are red beads

Fraction of yellow beads = 1 – 3/5 = 2/5

Fraction different between red beads and yellow beads = 3/5 – 2/5 = 1/5

There are 45 beads different

Total number of beads = 5 × 45 = 225

Alternative solution:

The ratio of the red beads to yellow beads = 3 : 5

Draw the math model based on ratio

From the model,

Different is 1 unit = 45

Beads in the box = 5 × 45 = 225

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