Question

How would you round 155 cm to two significant figures?

Answer 1

`160` cm

Explanation:

Step 1. Underline the first two numbers
`ul1 ul5 5` cm

Step 2. Look at the third number.
`ul1 ul5 color(red)(5)` cm

Recall your rounding rules.
- If the next number is 4 or less, round down.
- If the next number is 5 or more, round up.

Step 3. The number is `color(red)(5)` (or above), so round up and turn the last number into a zero.
`160` cm