Commutative property and multiplying by tens
Answers are for parents and teachers.
1
Write two multiplications for an array with 6 rows and 9 columns, and find the product.
6 × 9 = 54 and 9 × 6 = 54.
2
Complete the pattern: 4 × 10, 4 × 100, 4 × 1,000, 4 × 10,000.
40, 400, 4,000, 40,000.
3
Find 70 × 80 and 90 × 600.
5,600 and 54,000.
4
A school buys 30 packs of 500 sheets of paper. How many sheets is that?
30 × 500 = 15,000 sheets.
5
A tuk-tuk driver earns 200 LE a day. How much does he earn in 20 days? Check that the answer is reasonable.
20 × 200 = 4,000 LE. It is reasonable: 20 days of about 200 LE is a few thousand.