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 Percentage, Charting and Problem Solving.

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** **and Charts.

Upper primary school mathematics question UPQ191

Sarin’s family spends 35% of their family monthly income on transport. Of the remainder, they spends $500 on food, 40% on rent, 16% on miscellaneous items and the family saves the rest. If the family monthly income is $4500, how long will the family take to save enough to buy a dining table which costs $1650? Make a pie-chart of the movement of the family monthly income.

Solution:

The Family monthly income movement:

The family monthly Transport cost = 4500 × 0.35 = $1575

Remainder = 4500 – 1575 = $2925

The family monthly rental = 2925 × 0.40 = $1170

The family monthly Misc cost = 2925 × 0.16 = $468

The family monthly saving = 2925 – 500 – 1170 – 468 = $787

The family monthly saving equivalent to = 1650 ÷ 787 = 2.1 ≈ 3 months

It will need the family to save 3 months to buy the dining table.

The family monthly income distributions ($4500) |
||

Items |
Amount ($) |
Percentage (%) |

Transport |
1575 |
35 |

Foods |
500 |
11 |

Rent |
1170 |
26 |

Misc |
468 |
10 |

Saving |
787 |
18 |