Add a one-digit number to a two-digit number (no new ten)

Question 1

Sam worked out 52 + 3 = 82. What mistake did Sam make?

• A. Added 3 to the tens instead of the ones
• B. Forgot to add the tens
• C. No mistake: it is right

Question 2

85 + 2 = ?

Answer 

Question 3

Use the fact 4 + 4 = 8 to work out 64 + 4.

Answer 

Question 4

Daniel worked out 31 + 1 = 41. What mistake did Daniel make?

• A. Added 1 to the tens instead of the ones
• B. Forgot to add the tens
• C. No mistake: it is right

Question 5

35 + 1 = ?

Answer 

Question 6

Use the fact 5 + 2 = 7 to work out 95 + 2.

Answer 

Question 7

Nia worked out 80 + 7 = 150. What mistake did Nia make?

• A. Added 7 to the tens instead of the ones
• B. Forgot to add the tens
• C. No mistake: it is right

Question 8

76 + 2 = ?

Answer 

Question 9

Use the fact 1 + 2 = 3 to work out 21 + 2.

Answer 

Question 10

Diego worked out 96 + 1 = 106. What mistake did Diego make?

• A. Added 1 to the tens instead of the ones
• B. Forgot to add the tens
• C. No mistake: it is right

Question 11

61 + 6 = ?

Answer 

Question 12

Use the fact 2 + 4 = 6 to work out 92 + 4.

Answer 

Question 13

Omar worked out 96 + 3 = 126. What mistake did Omar make?

• A. Added 3 to the tens instead of the ones
• B. Forgot to add the tens
• C. No mistake: it is right

Question 14

31 + 1 = ?

Answer 

Question 15

Use the fact 5 + 4 = 9 to work out 25 + 4.

Answer 

Question 16

Aisha worked out 95 + 2 = 115. What mistake did Aisha make?

• A. Added 2 to the tens instead of the ones
• B. Forgot to add the tens
• C. No mistake: it is right