# Sarin’s father crossing the Causeway part 15 (Math Question)

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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, the Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids can learn to deal 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 a Lower primary school math question on Fraction and Problem Solving.

Read posting on Sarin’s father visits his friend in JB town to know about JB town as well as reading posting on Sarin’s father crossing the Causeway to know about the Johor-Singapore Causeway.

You can read the posting on Sarin learns the concept of Fraction (mathematics concept) to understand the concept of Fraction.

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

Lower primary school mathematics question LPQ97

At the Singapore and Johore causeway, they were many vehicles waiting at the custom check point for passing through.  2/5 of them were cars. The number of motorcycle was ½ the number of buses. If there were 640 motorcycles, how many buses were there?

Solution:

Using model, Per the model,

1 unit = 640

The number of buses at the check point = 2 × 640 = 1280

Alternative solution:

The fraction of Cars ==> 2/5

The fraction of buses and motorcycles = 1 – 2/5 = 3/5

Since motorcycles was ½ the number of buses,

The fraction of motorcycle ==> 1/5

The fraction of buses ==> 3/5 – 1/5 = 2/5

The number of Motorcycles = 640

The number of buses = 640 × 2 = 1280