Question

The length of Part 1 of the track is 59 inches and Part 2 is 72 inches. What is the total length of both parts of the track?
Use a mental math strategy to find the answer quickly.

• A. (i) 74 (ii) 131 (iii) 129
• B. (i) 70 (ii) 129 (iii) 131
• C. (i) 74 (ii) 129 (iii) 131
• D. (i) 70 (ii) 130 (iii) 132

Answer 1

The correct option is B (i) 70 (ii) 129 (iii) 131

Length of Part $1=59\text{inches}$
Length of Part $2=72\text{inches}$
Total length of both parts $=59+72\text{inches}$
Using the mental math ability of compensation, we can solve the question.
Therefore, the combined length of both parts of the track is 131 inches.

Option B (i) 70 (ii) 129 (iii) 131 is the correct answer.