Medium worksheet two deepens missing-number reasoning and explores subtraction patterns within 20. Children tackle nine fill-in-the-blank problems where the unknown moves around, including '18 - ___ = 11' and '___ - 9 = 6,' along with count-back challenges starting at 20. The matching activity then links four expressions like 17 - 6 and 20 - 8 with answers 6, 11, 12, and 14, encouraging first graders to spot fact-family relationships rather than recounting each problem from scratch.
Style:
Subtraction Within 20
Part A: Fill in the Missing Number
Write the missing number to complete each subtraction sentence.
1. 18 - 7 = 11
2. 15 - 9 = 6
3. Start at 20. Count back 8. You land on 12.
4. 17 - 9 = 8
5. 13 - 5 = 8
6. If 6 + 7 = 13, then 13 - 7 = 6.
7. If 8 + 9 = 17, then 17 - 9 = 8.
8. Start at 16. Count back 9. You land on 7.
9. If 5 + 9 = 14, then 14 - 9 = 5.
Part B: Match the Problem to Its Answer
Draw a line from each subtraction problem to its correct answer.
1. Match each subtraction problem to its answer.
17 - 6
→ 11
14
20 - 8
→ 12
6
13 - 7
→ 6
11
19 - 5
→ 14
12
Subtraction Within 20
★ Part A: Fill in the Missing Number
Write the missing number to complete each subtraction sentence.
1) 18 - 7 = 11
2) 15 - 9 = 6
3) Start at 20. Count back 8. You land on 12.
4) 17 - 9 = 8
5) 13 - 5 = 8
6) If 6 + 7 = 13, then 13 - 7 = 6.
7) If 8 + 9 = 17, then 17 - 9 = 8.
8) Start at 16. Count back 9. You land on 7.
9) If 5 + 9 = 14, then 14 - 9 = 5.
★ Part B: Match the Problem to Its Answer
Draw a line from each subtraction problem to its correct answer.
1) Match each subtraction problem to its answer.
17 - 6
→ 11
14
20 - 8
→ 12
6
13 - 7
→ 6
11
19 - 5
→ 14
12
Ready to Practice?
For Part A, write the missing number. For Part B, match each problem to its answer.
10 Questions
15-20 minutes
Auto-graded
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