Unit 15 – The four operations
This array shows the multiplication 24 × 3
3
First we multiply the tens by 3 and then we multiply the ones by 3. 24 × 3 = 20 × 3 = 60 4 × 3 = 12 60 + 12 = 72
4 We can use what we know about place value to help multiply numbers by 10.
3 4
34 × 10 4 0
3
1 Make an estimate first and then calculate the answer. 36 rounds to
to the nearest 10
10 10 10 10
10 10 10 10
10 6 10 6 10 6 10 6
tens × 4 =
tens or 160
My estimate is 160
36 × 4 =
× 4 =
because 3 tens × 4 =
tens
× 4 = +
=
195
9781380050687__text.indb 195
03/05/2022 10:20
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