# How do you reduce a number to a certain number of significant digits?

##### 1 Answer

May 20, 2017

Follow a step by step process.

#### Explanation:

Step 1. Underline the number of significant figures you need

Example. If you need to reduce

Step 2. Look at the next number (not underlined)

Example.

Step 3. Round up or down depending on the following rule

- If the next number is 5 or more, round up

- If the next number is 4 or less, round down

- Change the remaining numbers to zero

Example.