Lesson 15: Subtracting Two-Digit Numbers with Regrouping, Activity Subtracting Money — Practice Questions

1. 1. Calculate the difference: $64 - 29 = \_\_\_$

2. 2. When solving $82 - 47$, you must regroup. After regrouping the top number, what does the 2 in the ones place become?

   • A. 1
   • B. 2
   • C. 12
   • D. 10

3. 3. For which of the following subtraction problems is regrouping NOT required?

   • A. $45 - 18$
   • B. $71 - 33$
   • C. $58 - 26$
   • D. $90 - 65$

4. 4. To solve $91 - 54$, you first regroup. The 9 in the tens place becomes an 8, and the 1 in the ones place becomes \_\_\_.

5. 5. A bakery made 75 muffins and sold 48 of them. How many muffins are left? \_\_\_

6. 6. A baker made 92 cupcakes. She sold 57 of them. How many cupcakes does she have left? ___

7. 7. For which of the following subtraction problems is it necessary to regroup to find the answer?

   • A. $58 - 13$
   • B. $74 - 36$
   • C. $87 - 57$
   • D. $39 - 21$

8. 8. When solving the problem $65 - 28$, what is the correct first step of regrouping?

   • A. Rename 65 as 5 tens and 15 ones.
   • B. Rename 65 as 6 tens and 15 ones.
   • C. Do not regroup because 6 is greater than 2.
   • D. Subtract 5 from 8 in the ones place.

9. 9. The zero exponent rule states that any non-zero value raised to the power of 0 equals 1. Using this rule, what is the value of $(15m^4n^2)^0$? ___

10. 10. A student incorrectly solved $42 - 17$ and got the answer 35. What mistake did the student make?

    • A. They subtracted the smaller digit from the larger digit in the ones column.
    • B. They forgot to subtract the tens column.
    • C. They added the numbers instead of subtracting.
    • D. They correctly regrouped before subtracting.