A student showing work for 4.705 minus 3.6 = 4.669. The decimal for 3.6 is between the 0 and 5 in 4.705.
What mistake did Andrea make when solving the problem?
She did not align the decimal points.
She did not rename correctly.
She added instead of subtracted.
She did not subtract 15 and 6 correctly.
1 answer
Andrea made the mistake of not aligning the decimal points when performing the subtraction. This is evident from her statement that the decimal for 3.6 is between the 0 and 5 in 4.705. Properly aligning the decimal points is crucial in subtraction to ensure accurate calculation.
Therefore, the correct answer is: She did not align the decimal points.
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