(a) How could you calculate 23 x 4 on your calculator if the 4 button is broken? (b) How could you calculate 23 x 21 if the 2 bu
tton on your calculator is broken?
1 answer:
Answer:
23 x 4
=> 23 x (2 + 2)
=> 23 x 2 + 23 x 2
23 x 21
=> 23 x (3 x 7)
=> (23 x 3) x (23 x 7)
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