A family in Singapore part 21 (Math Question)


The blog postings are about the Singapore Math. The readers can learn from the postings on Solving Singapore Primary School Mathematics. You or your kids will learn the skills of dealing with Math modeling, Problem Sum from Lower Primary School to Upper Primary School level in Singapore school after reading the blog postings. This posting is an upper primary school math question on Percentage and Problem Sum.

You can click here and read the posting on 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 Percentage.

Upper primary school mathematics question UPQ266

Sarin’s father gave $1200 of his monthly salary to his mother as their family monthly household expenses. He saved the rest of his salary. If he deduced the household expenses by 14%, his savings increased by 20%. How much was Sarin’s father monthly salary?


                        14% reduction from the $1200 spending

                        100% ==> 1200

                        1% ==> 12

                        14% ==> 12 × 14 = $168

                        Amount reduced in spending = $168

                        Saving increased by $168 is 20%

                        20% ==> 168

                        10% ==> 84

                        100% ==> $840

                        The amount of saving = 168 × 100/20 = $840

                        Sarin’s father monthly salary = 1200 + 840 = $2040

 More Questions on Problem Sum. Click here…

More Questions on Percentage. Click here….


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