Sarin and his coin bank part 33 (Math Question)

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The blog postings are about the Singapore Math. The readers can learn from the postings about Solving Singapore Primary School Mathematics. The blog presenting the Math Concept, Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids can learn the skills of dealing with Math Modeling, 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 Fraction, and Problem Solving.

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

Read also the posting on  Sarin learns the concept of Fraction (mathematics concept) to understand and Fraction.

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

Upper primary school mathematics question UPQ323

Sarin spent 1/5 of his saving on a story book. He gave $46.80 to Hairu and had ½ of his saving left. How much saving did he have left?

Solution:

            Sarin had ½ of his saving left

            He spent ½ of his saving on a story book (1/5) plus gave $46.80 to Hairu

            Draw the model

 

 

 

            From the model

            3 units = 46.8

            1 unit = 15.6

            He had left with 15.6 × 5 = $78

Alternative Solution:

            Sarin had ½ of saving left

            Sarin spent and gave away = 1 – ½ = ½

            Sarin spent 1/5 fraction of the saving on a story book

            Fraction of saving Sarin gave to Hairu = ½ – 1/5 = 3/10

            3 units = 46.8

            1 unit = $15.6

            Sarin saving = 10 × 15.6 = $156

            Sarin saving left = 156 ÷ 2 = $78

More Questions on Problem Sum. Click here….

More Questions on Fraction. Click here….

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