# Sarin, Hairu and Fatimah make greeting cards for Mother’s Day part 17 (Math Question)

Standard

The blog postings are about the Singapore Math. The readers can learn from the postings on 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 will learn the skill of dealing with Math Question Solving, Math Modeling and Problem Sums from Lower Primary School to Upper Primary School level after reading the blog postings. This posting is an upper 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.

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

Upper primary school mathematics question UPQ350

Sarin makes his greeting card using a piece of square cardboard with 4 coloured triange shapes. The figure below, not drawn to scale, show the design. ABPQ is a square. Find the area of the blue triangle.

Solution:

ABPQ is a square

AB = AQ = 9cm

The area of the pink triangle = ½ × 9 × 4 = 18 cm2

The area of the pink and blue triangle = ½ × 9 × 9 = 40 ½ cm2

The area of the blue triangle = 40 ½ – 18 = 22 ½ cm2