Question

Mary buys a reel of thread for sewing. There are 10 m of thread on the reel. She uses 210 cm. How much is left on the reel in centimeters?

Answer 1

Answer: 790 cm

1 m=100cm

There was 10 m of thread 1000cm

She used 210cm

Explanation:

Answer 2

10meters=1000cm
1000-210=890
Mary has 890 centimeters of thread left on the reel.