Estimate the answer: What is 20% of 416?

Explanation

We will estimate 10% of 416, and double (multiply by 2) the result.   20% of a number is twice as much as 10% of a number.

Solution

Since 10% of 416 is 41.6 (or abount 41), it follows that 20% of 416 is abount 2.  42, which is 84.  Thus,

Because 10% of 416 = 41.6 ≈ 42 and 2 x 42 = 84.

• 20% of 416 ≈ 84