Factors and multiples
Now I have 15 lots of 7, so 15 × 7 = 105. 7 × 15 = 7 × 3 × 5 = 21 × 5 = 105
15 is 5 × 3. I can multiply by 15 by multiplying by 3 and then by 5.
Let’s Try It
1 Copy and complete the calculation to 12 × 18. 12 × 18 = 12 × 9 ×
=
×
=
Multiplying by 18 is tricky! We can use the multiplication fact 9 × 2 = 18 to help us.
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01/12/2021 15:11
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