a) Multiply (i) 50 x 7 ii) 51 x 7
(i) We know that 5 x 7 = 35.
50 is ten times bigger than 5,
so 50 x 7 must be ten times bigger than 5 x 7
50 x 7 = 35 x 10 = 350
(ii) We have found that 50 x 7 = 350
51 x 7 = (50 x 7) + (1 x 7) = 350 + 7 = 357
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