Question

Deanna estimated the product of 6.45 and 10.2 below.

(6.45) (10.2) ~ 6 x 10 = 60

How does the estimate compare to the exact product?

A: the estimate is high because both factors are rounded down.

B: The estimate is low because both factors are rounded down.

C: The estimate is high because both factors are rounded up.

D: The estimate is low because both factors are rounded up.

Answer 1

Hello there!

The answer to this question is, B: The estimate is low because both factors are rounded down.

Answer 2

The appropriate choice is ...
B: The estimate is low because both factors are rounded down.

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Since Deanna is using 10 as one of her factors and 10 is easy to multiply by, she may as well round 6.45 up to 6.5. The estimate of 65 figured this way will be a lot closer to the exact product, 65.790.