How would you round 155 cm to two significant figures?

May 20, 2017

Answer:

$160$ cm

Explanation:

Step 1. Underline the first two numbers
$\underline{1} \underline{5} 5$ cm

Step 2. Look at the third number.
$\underline{1} \underline{5} \textcolor{red}{5}$ 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 $\textcolor{red}{5}$ (or above), so round up and turn the last number into a zero.
$160$ cm