Question

Estimate the product
$3.5\times 6.89$

• A. 28
• B. 21
• C. 25
• D. None of these

Answer 1

The correct option is A 28

To estimate the product $3.5\times 6.89$

We need to estimate both 3.5 and 6.89 to the nearest natural number.

For estimation to the nearest natural number we look at the tenths place and follow the estimation rule

Rule: If the digit is 5 or greater than 5 we round up, if the digit is less than 5 we round down.

3.5 has 5 at tenths place, it rounds up to 6
Similary,
6.89 has 8 at tenths place, it rounds up to 7

$3.5\times 6.89=4\times 7=28$
Hence, the estimated product is 28.