Question

Which choice shows the best estimate of the product 0.51 × 783?

A.1/2 × 800

B.1 × 1,000

C.5 × 700

D.50 × 800

Answer 1

the answer is A.1/2×800

Answer 2

Explanation:

We are given to ask a product of 0.51x783

If we want to find out the product without actual multiplication we can round off both factors to nearest and do

0.51 is very near to
`0.5 = 1/2`

783 rounded off would be 800 since
`second digit >5`

So the product would be approximately

`(1)/(2) *800`

i.e. option A

Option B is incorrect because 1000 is very far from 783

C is wrong because 700 is not correct round off of 783

D is wrong since 50 is not round off value of 0.51