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Let's first note that
7 X 50 = 350, and
7 X 3 = 21.
If we add those two results together, we get 371.
I guess we just have to assume that those first two results just roll off the top of your head. It helps if you remember that 7 X 5 = 35 and already realise that you can simply add a zero to the end and get 7 X 50.
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∙ 11y ago
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