The idea is to round both numbers to the nearest multiple of 10 (in this case), then multiply. After rounding, you should be able to do the multiplication in your head - but if you have trouble with that, try to do it with pencil and paper first.
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13+17+17+34+55+79+79 294 294/7 42
1,817
when both factors in a multiplication problem are rounded up to estimate the product, the estimate is an overestimate.
Explain how you know whether an estimate of a product is an overestimate or an underestimate?
No need to estimate. The true answer is 345