# Sarin, Hairu and Fatimah make greeting cards for Mother’s Day part 6 (Math Question)

Standard

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 Shape and Area.

You can read the story of Sarin and the siblings making greeting cards for their mother by reading the posting on Sarin, Hairu and Fatimah make greeting cards for Mother’s Day in Welcome page.

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

Read also the posting on Sarin learns Shapes and Solids in school (Math Concept) to know about shapes.

Upper primary school mathematics question UPQ172

Hairu decided to have his card in the shape of a quarter circle and slot in a rectangle envelope as the figure shown below. The card was made of 2 quadrants and a rectangle. Using the calculator value of π, find the area of the pink shaded part. Correct your answer to 2 decimal places.

Solution:

The area of the big quadrant = ¼ × π × 16 × 16 = 64π

The area of the small quadrant = ¼ × π × 6 × 6 = 9π

The area of the rectangle = 16 × 6 = 96

The area of the pink shaded part = 64π + 9π – 96 = 133.34 cm2