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.

12.09 minus 8.30 = 4.79. All decimals are aligned. The 0 in 12.09 is crossed out and a 1 is above it. The 2 is crossed out in 12.09 and a 1 is above it.

Which error did Juanita make?

Answer 1

Let me draw this so it's easier to visualize

Answer 2

she did 12 minus 8, which is where the 4 comes from, not 11 minus 8, which would get 3 thus the answer is 3.79. Im not sure about that, but that's what I think.

Answer 3

Also is this multiple choice?

Answer 4

the things u can put for the answers are 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 5

and no multiple choice