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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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12y ago

What else can I help you with?