Question

Add the following and answer with the correct number of significant figures: $13.4+2.42=$

Answer 1

$13.4$ has one decimal place.
$2.42$ has two decimal place.

Adding these two numbers
$13.4+2.42=15.82$

Using the rules for addition, the final result should have as amny decimal places as there are in the number with the least decimal places.

Hence,we will round off $15.82$ to one decimal place and will get $15.8$.