Let’s Try It
Use the diagram to help you find the answer to: (a) 34 × 21 (b) 34 × 19
34 × 19 = 34 × 20 = 680 34 × 21 =
− 34
+ 34
Let’s Practise
Multiple the numbers mentally. Show your working out. (a) 19 × 7 = (b) 23 × 19 =
(c) 33 × 21 =
E
Talk to a partner about the different strategies to find the answer to this tricky calculation! (71 × 21) − (71 × 19)
218
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