Missing numbers, mass and perimeter
Answers are for parents and teachers.
1
Find the missing numbers: ? × 9 = 63, 72 ÷ ? = 8 and ? ÷ 6 = 5.
63 ÷ 9 = 7, 72 ÷ 8 = 9 and 6 × 5 = 30. The missing numbers are 7, 9 and 30.
2
Write a sharing story and a grouping story for 36 ÷ 4 = 9.
Answers vary, for example: Sharing: 36 sweets are shared among 4 children, 9 each. Grouping: 36 sweets are packed 4 in a bag, which makes 9 bags.
3
A bag of 5 mangoes has a mass of 1,000 g and all the mangoes are equal. What is the mass of one mango?
1,000 ÷ 5 = 200 g.
4
Find the perimeter of a regular octagon with sides of 9 cm.
8 × 9 = 72 cm.
5
Rahma has 400 LE. She buys a coat for 165 LE and a scarf for 70 LE. How much money is left? Show both steps.
Step 1: 165 + 70 = 235 LE. Step 2: 400 − 235 = 165 LE left.