Check an answer with the inverse operation

Question 1

Ben says 78 − 58 = 10. Check by adding 10 + 58. Is Ben right?

• A. Yes
• B. No

Question 2

Which calculation checks that 67 + 21 = 88?

• A. 88 − 21 = 67
• B. 21 + 21 = 42
• C. 88 + 21 = 109
• D. 67 − 21 = 46

Question 3

Fatima says 94 − 24 = 70. Check by adding 70 + 24. Is Fatima right?

• A. Yes
• B. No

Question 4

Which calculation checks that 68 + 31 = 99?

• A. 31 + 31 = 62
• B. 68 − 31 = 37
• C. 99 − 31 = 68
• D. 99 + 31 = 130

Question 5

Sam says 91 − 17 = 84. Check by adding 84 + 17. Is Sam right?

• A. Yes
• B. No

Question 6

Which calculation checks that 49 + 23 = 72?

• A. 23 + 23 = 46
• B. 72 + 23 = 95
• C. 72 − 23 = 49
• D. 49 − 23 = 26

Question 7

Daniel says 76 − 38 = 38. Check by adding 38 + 38. Is Daniel right?

• A. Yes
• B. No

Question 8

Which calculation checks that 23 + 26 = 49?

• A. 49 + 26 = 75
• B. 26 + 26 = 52
• C. 23 − 26 = -3
• D. 49 − 26 = 23

Question 9

Hana says 67 − 32 = 35. Check by adding 35 + 32. Is Hana right?

• A. Yes
• B. No

Question 10

Which calculation checks that 44 + 24 = 68?

• A. 68 − 24 = 44
• B. 68 + 24 = 92
• C. 44 − 24 = 20
• D. 24 + 24 = 48

Question 11

Luis says 56 − 20 = 37. Check by adding 37 + 20. Is Luis right?

• A. Yes
• B. No

Question 12

Which calculation checks that 67 + 15 = 82?

• A. 15 + 15 = 30
• B. 82 + 15 = 97
• C. 67 − 15 = 52
• D. 82 − 15 = 67

Question 13

Sofia says 81 − 36 = 35. Check by adding 35 + 36. Is Sofia right?

• A. Yes
• B. No

Question 14

Which calculation checks that 27 + 19 = 46?

• A. 46 − 19 = 27
• B. 19 + 19 = 38
• C. 46 + 19 = 65
• D. 27 − 19 = 8

Question 15

Ava says 54 − 24 = 30. Check by adding 30 + 24. Is Ava right?

• A. Yes
• B. No

Question 16

Which calculation checks that 29 + 20 = 49?

• A. 49 + 20 = 69
• B. 20 + 20 = 40
• C. 49 − 20 = 29
• D. 29 − 20 = 9