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 11.1/99 - 8.30 4.79 Which error did Juanita make? She subtracted instead of added. She aligned the decimal points incorrectly. She did not regroup correctly when subtracting. C She made a computational error when subtracting

## Step 1<br />Juanita's subtraction problem is \(12.09 - 8.3\). The problem with Juanita's subtraction is that she did not align the decimal points correctly. <br /><br />## Step 2<br />In the subtraction problem, the decimal points should be aligned such that the numbers in the same place value are in the same column. For example, the tenths place should be aligned with the tenths place, the hundredths place with the hundredths place, and so on.<br /><br />## Step 3<br />Juanita's subtraction problem, \(11.1/99 - 8.30\), does not have the decimal points aligned correctly. The correct subtraction should be \(12.09 - 8.30\).