Question

Mary buys 10 m of a reel of thread for sewing. She uses 200 cm. How many centimeters of the reel is left?

• A. 8,000 cm
• B. 8 cm
• C. 80 cm
• D. 800 cm

Answer 1

The correct option is D 800 cm

Mary buys 10 m of a reel of thread.

Converting m into cm, we see:

So, 1 m = 100 cm
⇒ 10 m = 10 × 100 = 1,000 cm

Mary uses only 200 cm.

So, the length of thread remaining is
= 1,000 – 200 cm = 800 cm