The product of 517 and 291 is estimated to be approximately in the neighborhood of roughly 150,447 give or take.
For a rough estimate, consider this as 500 and 300. Ignoring the zeroes, 5 time 3 is 15. Then tack the 4 zeroes removed onto the 15, giving 150,000. The figure given above is the exact answer.
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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?
16.1562
No need to estimate. The true answer is 345
81,900