A family in Singapore part 18 (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. You or your kids can learn dealing with Math modeling, Problem Sum from Lower Primary School to Upper Primary School level in Singapore school. This posting is a primary school math question on Fraction and Problem Solving.

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

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

Upper primary school mathematics question UPQ198

Sarin’s father gave half of his salary and $80 to Sarin’s mother as family spending. Then he spent half of his remaining salary and $70 on rent. How much was his salary if he had $360 left? 

 Solution:

             Draw the math model on Sarin’s father salary

            Per the model                               

            1 units = 360 + 70 + 40 = 470

            Sarin’s father salary = 4 × 470 = $1880

Alternative solution:

                                    ½ of remainder = 360 + 70 = $ 430

                                    Remainder = 2 × 430 = $ 860

                                    ½ of salary = 860 + 80 = $940

                                    Sarin’s father salary = 2 × 940 = $1880  

More Questions on Problem Sum. Click here…

More Questions on Fraction. Click here….

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