This Grade 1 worksheet teaches the make-ten strategy for adding three numbers within 20. First graders complete nine fill-in problems, some that ask which addend makes 10 first and others that require the final sum. A four-pair matching activity connects three-addend expressions like 4+6+3 to their correct sums, helping students internalize how finding a 10-partner turns hard three-number addition into one quick step for flexible math thinking.
Style:
Adding Three Numbers
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. 2 + 8 + 5 = 15
3. 7 + 3 + 4: make 10 with 7 and 3
4. 7 + 3 + 4 = 14
5. 6 + 4 + 2 = 12
6. 1 + 9 + 5 = 15
7. 5 + 5 + 8 = 18
8. 3 + 7 + 6 = 16
9. 8 + 2 + 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
Adding Three Numbers
★ 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) 2 + 8 + 5 = 15
3) 7 + 3 + 4: make 10 with 7 and 3
4) 7 + 3 + 4 = 14
5) 6 + 4 + 2 = 12
6) 1 + 9 + 5 = 15
7) 5 + 5 + 8 = 18
8) 3 + 7 + 6 = 16
9) 8 + 2 + 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
Ready to Practice?
Complete each section carefully.
10 Questions
10-15 minutes
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