Addition Within 10 — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. A frog catches 6 flies in the morning and 4 more at night. How many flies did it catch in all?
A) 9
B) 10
C) 8
D) 11
6 + 4 = 10. Morning flies plus night flies go together: 6 and 4 are a make-ten pair, so the frog ate 10 flies in all.
2. Which addition sentence does NOT equal 8?
A) 3 + 5
B) 6 + 2
C) 4 + 3
D) 1 + 7
4 + 3 = 7, not 8. The other sums — 3 + 5, 6 + 2, and 1 + 7 — each make 8, so 4 + 3 is the odd one out.
3. Which two numbers add up to 7?
A) 2 + 6
B) 5 + 3
C) 3 + 4
D) 4 + 4
3 + 4 = 7. Count on from 4 three more times: 5, 6, 7. The other choices make 8, 8, and 8, not 7.
4. Lily picks 2 flowers, then picks 5 more. How many flowers does she have?
A) 6
B) 8
C) 9
D) 7
2 + 5 = 7. Flip to 5 + 2 and count on: 6, 7. Lily ends up with 7 flowers in her bunch.
Part B: Fill in the Blank
Write the correct answer on each line.
1. 5 + 3 = 8
5 + 3 = 8. From 3 you need 5 more hops to reach 8, so the blank is 5.
2. 6 + 3 = 9
6 + 3 = 9. The jump from 6 to 9 is just 3 numbers, so the missing part is 3.
3. 0 + 7 = 7
0 + 7 = 7. If the total is the same as the other part, nothing was added — the answer is zero.
4. 4 + 6 = 10
4 + 6 = 10. 4 and 6 are make-ten partners that fill a full ten-frame.
5. 8 + 1 = 9
8 + 1 = 9. Adding 1 moves to the next number, so the part before 9 is 8.