This Grade 1 worksheet teaches first graders to reorder three addends so a ten-bond pair comes first. Nine fill-in problems model swapping numbers like 7+3+6 into 7+3 then +6. A matching activity pairs four rearranged expressions with totals within 20. Students learn why making a friendly ten first speeds up mental math when working with three-number addition sentences and builds early flexible number sense.
Style:
Adding Three Numbers
Part A: Fill in the Blank
Write the missing word or number on each line.
1. 7 + 3 + 6. First 7 + 3 = 10. Then 10 + 6 = 16
2. 2 + 5 + 8. Rearrange: 2 + 8 = 10. 10 + 5 = 15
3. 4 + 9 + 1. First 9 + 1 = 10. 10 + 4 = 14
4. 6 + 2 + 4 = 12
5. 3 + 7 + 5 = 15
6. 8 + 1 + 2 = 11
7. 5 + 4 + 5 = 14
8. 9 + 2 + 1 = 12
9. 3 + 6 + 4 = 13
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
6 + 4 + 3
→ 13
13
8 + 2 + 5
→ 15
15
9 + 1 + 4
→ 14
14
7 + 3 + 2
→ 12
12
Adding Three Numbers
★ Part A: Fill in the Blank
Write the missing word or number on each line.
1) 7 + 3 + 6. First 7 + 3 = 10. Then 10 + 6 = 16
2) 2 + 5 + 8. Rearrange: 2 + 8 = 10. 10 + 5 = 15
3) 4 + 9 + 1. First 9 + 1 = 10. 10 + 4 = 14
4) 6 + 2 + 4 = 12
5) 3 + 7 + 5 = 15
6) 8 + 1 + 2 = 11
7) 5 + 4 + 5 = 14
8) 9 + 2 + 1 = 12
9) 3 + 6 + 4 = 13
★ Part B: Matching
Match each item on the left to the correct answer on the right.
1) Match each item to its correct answer.
6 + 4 + 3
→ 13
13
8 + 2 + 5
→ 15
15
9 + 1 + 4
→ 14
14
7 + 3 + 2
→ 12
12
Ready to Practice?
Complete each section carefully.
10 Questions
10-15 minutes
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