Answer:
18 pieces
Explanation:
This is a division problem.
1 m = 100 cm
To convert from cm to m we divide the length in cm by 100.
40 m + 50 cm = 40 m + 50/100 m = 40.5 m
The rope is 40.5 m long.
9/4 m = 2.25 m
Each piece is 2.25 m long.

Answer: 18 pieces