The blog postings are about the Singapore Math. The readers can learn from the postings about Solving Singapore Primary School Mathematics. The blog presenting the Math Concept, Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids can acquire the skill of dealing with Math Modeling, Math Problem Solving and Problem Sum from Lower Primary School to Upper Primary School level after reading the blog postings. This posting is an upper primary school math question on Ratio, Percentage and Area.

You can read posting **Sarin learns Perimeter, Area and Volume in school(Math Concept) **to learn the concept of perimeter and area.

You should read the posting on **Sarin learns Average Number, Percentage and Charting in school (Math Concept)** to understand the concept of Percentage**.**

Also to read the posting on **Sarin learns concept of ratio in school **to understand the concept of Ratio.

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

**Upper primary school mathematics question UPQ315**

The ratio of the area of A to B is 1: 2. If 30% of B overlaps with A, what percentage of the whole figure is not overlapped?

Solution:

The ratio of the area of A to B = 1 : 2

30% of B will overlap with 2 × 30% = 60% of A

The model

The total units of the figure = 24

The units of the figure not overlep = 24 – 6 = 18

The percentage of the whole figure is not overlapped = 18/24 × 100% = 75%

Alternative Solution:

The ratio of the area of A to B = 1 : 2

30% of B will overlap with 2 × 30% = 60% of A

** **The percentage of B not overlapped = 70%

The percentage of A not overlapped = 40%

Whole figure not overlapped = (70 + 40 × 2) ÷ 2 = 75%