Check an answer with the inverse operation

Question 1

Aisha says 86 − 63 = 23. Check by adding 23 + 63. Is Aisha right?

• A. Yes
• B. No

Question 2

Which calculation checks that 66 + 15 = 81?

• A. 15 + 15 = 30
• B. 66 − 15 = 51
• C. 81 + 15 = 96
• D. 81 − 15 = 66

Question 3

Amara says 65 − 39 = 36. Check by adding 36 + 39. Is Amara right?

• A. Yes
• B. No

Question 4

Which calculation checks that 36 + 18 = 54?

• A. 54 + 18 = 72
• B. 36 − 18 = 18
• C. 54 − 18 = 36
• D. 18 + 18 = 36

Question 5

Jamal says 86 − 29 = 47. Check by adding 47 + 29. Is Jamal right?

• A. Yes
• B. No

Question 6

Which calculation checks that 49 + 18 = 67?

• A. 67 − 18 = 49
• B. 18 + 18 = 36
• C. 67 + 18 = 85
• D. 49 − 18 = 31

Question 7

Sam says 65 − 43 = 12. Check by adding 12 + 43. Is Sam right?

• A. Yes
• B. No

Question 8

Which calculation checks that 58 + 17 = 75?

• A. 75 − 17 = 58
• B. 75 + 17 = 92
• C. 58 − 17 = 41
• D. 17 + 17 = 34

Question 9

Omar says 67 − 39 = 28. Check by adding 28 + 39. Is Omar right?

• A. Yes
• B. No

Question 10

Which calculation checks that 42 + 28 = 70?

• A. 70 + 28 = 98
• B. 70 − 28 = 42
• C. 42 − 28 = 14
• D. 28 + 28 = 56

Question 11

Yuki says 70 − 34 = 37. Check by adding 37 + 34. Is Yuki right?

• A. Yes
• B. No

Question 12

Which calculation checks that 62 + 25 = 87?

• A. 25 + 25 = 50
• B. 62 − 25 = 37
• C. 87 − 25 = 62
• D. 87 + 25 = 112

Question 13

Kofi says 76 − 21 = 45. Check by adding 45 + 21. Is Kofi right?

• A. Yes
• B. No

Question 14

Which calculation checks that 56 + 29 = 85?

• A. 56 − 29 = 27
• B. 85 − 29 = 56
• C. 85 + 29 = 114
• D. 29 + 29 = 58

Question 15

Priya says 82 − 42 = 30. Check by adding 30 + 42. Is Priya right?

• A. Yes
• B. No

Question 16

Which calculation checks that 38 + 28 = 66?

• A. 38 − 28 = 10
• B. 66 + 28 = 94
• C. 66 − 28 = 38
• D. 28 + 28 = 56