How would you round 155 cm to two significant figures?

1 Answer
May 20, 2017

Answer:

#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