A family in Singapore part 44 (Math Question)


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 will able to acquire knowledge of dealing with the Math Modeling, thw 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 upper primary school math question on Percentage.

You can click here and read the posting  A family in Singapore about Sarin’s family.

You should read the posting on Sarin learns Average Number, Percentage and Charting in school (Math Concept) to understand the concept of Average Number.

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

Upper primary school mathematics question UPQ398

Sarin’s father had $2000. He spent 10% of his money on clothings and 20% of it on a washing machine. How much money had he left?



            Per the model

                        10units = 2000

                        1 unit = $200

                        The amount of money that Sarin’s father left = 7 × 200 = $1400

Alternative solution:

            The percentage of money left = 100% – 10% – 20% = 70%

                                    100% ==> $ 2000

                                    10% ==> $ 200

                                    70% ==> 7 × 200 = $1400

         The amount of money that Sarin’s father left = $1400

More Questions on Percentage. Click here…


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