# What is the sum of 334.540 g and 198.9916 g to the correct significant figure?

##### 1 Answer

Jul 20, 2016

#### Explanation:

The rule for adding or subtracting numbers with finitely many significant digits is:

1) Find the lowest power of 10 place value with significant digits in *both* terms

2) Round the sum or difference to that power of 10.

So:

1) The number

2) So round your sum to a multiple of

Thus