Sarin’s family and Ramadan Part 19 (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 postings present the Math Concept, Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids can learn the skills to deal with Math Modeling, Math Problem Solving and Problem Sum from Lower Primary School to Upper Primary School level. This posting is an upper primary school math question on Fraction and Problem Sum.

You can read the posting on Sarin’s family and Ramadan in Welcome page about story of Sarin’s family during Ramadan.

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

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

Upper primary school mathematics question UPQ557

Ramadan is the period of giving back and caring of the elderly. Sarin’s mother baked a total of 130 vanilla and chocolate cookies for giving back during the dinner gathering in the mosque. ½ of the vanilla cookies were 10 less than 1/3 of the chocolate cookies. How many chocolate cookies did Sarin’s mother baked?



From the model,

5 units = 130 – 30

5 units = 100

1 unit = 20

The number of chocolate cookies Sarin’s mother baked = 3× 20 + 3 × 10 = 90

Alternative solution:

A third of chocolate cookies is half of vanilla cookies plus 10,

1/3 Chocolate cookies ==>  1/2 vanilla cookies + 10

Chocolate cookies ==>  3/2 vanilla cookies + 30

Total number of cookies ==>  5/2 vanilla cookies + 30

130 ==>  5/2 vanilla cookies + 30

100 ==> 5/2 vanilla cookies

1/2 vanilla cookies ==> 100 ÷ 5 = 20

Chocolate cookies ==> 3 × 20+ 30 = 90

 More Questions on Problem Sum. Click here…..

More Questions on Fraction. Click here….


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s