Question

Juanita ran 8.3 miles in Week 1 and 12.09 miles in Week 2. She used the subtraction below to determine how much farther she ran in Week 2 than in Week 1.

8.3 - 12.09 = 4.79
Which error did Juanita make?
A. She subtracted instead of added.
B. She aligned the decimal points incorrectly.
C. She did not regroup correctly when subtracting.
D. She made a computational error when subtracting.

Answer 1

Answer: It is A because it specifically states if you read it correctly you will need to do math 12.09 miles - 8.3 miles.

Step-by-step explanation:

Answer 2

Juanita made a computational error while subtracting Week 1's mileage from Week 2's. The correct answer is that she ran 3.79 miles farther in Week 2, not 4.79 miles.

Step-by-step explanation:

The error Juanita made is D. She made a computational error when subtracting. The correct way to find how much farther she ran in Week 2 than in Week 1 is by subtracting the Week 1 mileage from the Week 2 mileage: 12.09 miles (Week 2) - 8.3 miles (Week 1). When aligning the decimal points and subtracting, we get:

12.09

- 8.30

————

3.79

Therefore, Juanita ran 3.79 miles farther in Week 2 than in Week 1, not 4.79 miles.