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840/12

Cancel down by '2'

420/6

Cancel down by '2' again

210/3

Cancel down by '3'

70/1 = 70 The answer!!!!!

Another way is to think Remember you muktipokication tables, 7 x 12 = 84 . Hence 70 x 12 = 840

or

84/12 = 7 , Then 'stick a '0' on the end because it is '840'. Hence 70 . This is a quick casual method.

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lenpollock

Lvl 17
6d ago

What else can I help you with?