Adding Three Numbers — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. 2 + 8 + 5: make 10 with 2 and 8
2+8=10, then 10+5=15.
2. 2 + 8 + 5 = 15
2+8=10, then 10+5=15.
3. 7 + 3 + 4: make 10 with 7 and 3
7+3=10, then 10+4=14.
4. 7 + 3 + 4 = 14
7+3=10, then 10+4=14.
5. 6 + 4 + 2 = 12
6+4=10, then 10+2=12.
6. 1 + 9 + 5 = 15
1+9=10, then 10+5=15.
7. 5 + 5 + 8 = 18
5+5=10, then 10+8=18.
8. 3 + 7 + 6 = 16
3+7=10, then 10+6=16.
9. 8 + 2 + 9 = 19
8+2=10, then 10+9=19.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
4 + 6 + 3
→ 13
13
1 + 9 + 7
→ 17
17
5 + 5 + 4
→ 14
14
2 + 8 + 6
→ 16
16
Find the two that sum to 10, then add on.