Question

What is the best estimate for 81.9 x 4.6?A.100B.360C.400D.8,000

Answer 1

The question is given below as

`81.9*4.6`

Concept:

We will estimate first and then multiply

Step 1:

81.9 is closer to 80 than it is closer to 90(to the nearest tens)

`81.9\text{ rounds down to 80}`

Step 2:

4.6 is closer to 5 than it is closer to 4(to the nearest unit)

`4.6\text{ rounds up to 5}`

Step 3:

Multip[ly the two estimates

`\begin{gathered} =80*5 \\ =400 \end{gathered}`

Hence,

The final answer is = 400

OPTION B is the right answer