2-min Fluency Warm-up — Solve in your head.
8 + 8 =
14 − 7 =
6 + 9 =
13 − 5 =
A centimeter (cm) is smaller than an inch. Your fingertip is about 1 cm wide. We use cm to measure small things carefully.
Estimate First! Look at each line. Write your estimate BEFORE you measure. Then measure with your cm ruler.
My estimate: cm
Measured: cm
My estimate: cm
Measured: cm
My estimate: cm
Measured: cm
My estimate: cm
Measured: cm
Was your estimate close? A good estimate is within 2 cm!
Circle the best unit to measure each object: cm, inches, feet, or meters.
The length of an ant
cm | inches | feet | meters
The height of a door
cm | inches | feet | meters
The length of your shoe
cm | inches | feet | meters
The length of a soccer field
cm | inches | feet | meters
Read carefully. Think about what is happening. Draw if it helps!
Maya's ribbon is 30 cm long. She cuts off a piece that is 12 cm to wrap a present. How long is the ribbon that is left?
Draw or write your thinking:
cm