Question

QuizAcuve1In what step did her first error occur?Katie wrote these steps to find the estimated differencebetween 69 and 31.Step 1: 69 rounded to the nearest ten is 70,Step 2: 31 rounded to the nearest ten is 40,Step 3: The term difference means "to subtract."Step 4: The estimated difference between 69 and 31 is70-40 = 30Step 1Step 2Step 3Step 4

Answer 1

The first error occured in step 2

When she rounded 69 to the nearest ten, she was correct. However, when she rounded 31 to the nearest ten, she got that wrong.

The digit 1 in "31" is an insignificant digit hence it should be rounded to zero and then she would have 30 and NOT 40.

This means 31 rounded to the nearest ten is 30.