We can show this using a formal written method
2 3 × 1 4 9 2
multiply by 1s multiply by 10s
2 3 0 3 2 2
1 (a) Complete these two multiplications.
2 1 2 1 × 3 × 3 0
Talk to a partner about what is the same and what is different. (b) Use your answers to give the answer to 21 × 33.
1 What mistake has been made in each of these calculations? Can you find the correct answer? (a) 2 3 × 3 4 (b) 6 2 × 4 7
9 2 6 9 1 6 1
1 4 3 4 3 8
196
9781380050717__text.indb 196
28/04/2022 12:13
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