Marcus is trying to find 45-13. His work is shown. What is Marcus's mistake?
Step
1: Subtract the wholes.
4-1=3
Step 2: Subtract the fractions.
5
3
2 6
Step 3: Subtract the differences. 3 - 2 6 4
Marcus should have changed 3 to before subtracting in step 3.
6
Marcus should have added the fractions instead of subtracting them in step 2.
Marcus should have added the differences instead of subtracting them in step 3.
Marcus should have changed 3 to before subtracting in step 3.
18 6
Done->
Marcus's mistake is that he should have added the fractions instead of subtracting them in Step 2.
Marcus's mistake is that he should have changed 3 to 33 before subtracting in step 3.
Marcus's mistake is that he subtracted the fractions in Step 2 instead of adding them. In this case, to subtract 13 from 45, he should have borrowed 1 from the 4 in the tens place, making it 3, and added it to the 5 in the ones place, making it 15. So, the correct calculation should have been:
45-13 = 32
Therefore, the correct answer is 32.