Question

Detective Z builds a 567 feet tall tower. Steady paints the tower to 118 feet. How many feet are still left to be painted?
Choose the correct option to subtract using the compensation strategy.

• A. 443 feet
• B. 449 feet
• C. 449 feet
• D. Both A and C are correct

Answer 1

The correct option is D Both A and C are correct

Length of the tower Detective Z built $=567\text{feet}$
Length of the tower painted by Steady $=118\text{feet}$
Length of the tower left to be painted $=567-118\text{feet}$
Using the mental math ability of compensation, we can solve the problem.
The closest 10 to 118 is 120 and $120=118+2$
So, we are adding 2 to 118 to solve the problem easily.
Another possibility is Option C, rounding off 118 to 110 by subtraction 8 from $118(118-8=110)$.
Hence, the strategies used in Options A and C are the correct ones, and the length of the tower left to be painted is 449 feet.