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 Math Model and Problem Sum.
You can read the posting on Sarin and his coin bank on the story of coin bank.
Upper primary school mathematics question UPQ165
Sarin and Hairu had a total of $338. After Sarin saved $49 more and Hairu spent half of his money, they both had the same amount of money. How much did each of them have at first?
Draw a model start with ame amount at the end then work backward.
Total = 338 + 49 = 387
1 unit = 387/3 = 129
Hairu has at first = 2 × 129 = $258
Sarin has at first = 129 – 49 = $80