Multiplying 2-digit numbers
Look at these arrays. What is the same and what is different about them?
1
1
1
1
10 10 10 10
1
1
1
1
10 10 10 10
Leon says that 4 ones × 2 = 8 ones or 8, so 4 tens × 2 = 8 tens or 80. Do you agree? What other connections can you make between multiplying a number of ones and multiplying the same number of tens?
Look at this array.
1
It shows that 3 × 4 = 12 It also shows that 4 × 3 = 12 So, 3 × 4 = 4 × 3
Let’s look at another array.
2
It shows that 3 × 14 = 52 It also shows that 14 × 3 = 52 So, 3 × 14 = 14 × 3
Check the answer on a calculator. Explain the steps you take.
194
9781380050687__text.indb 194
03/05/2022 10:20
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