Subtraction Within 20
Sample 1 · Seed leaf-18-1-subtraction-within-20-sample-a7
1. 9 − 2 = ___
2. Find the difference: 15 − 9
3. Solve: ___ = 13 − 2
4. 20 − 9 = ___
1st GradeSubtraction1.OA.C.6
Subtraction Within 20 Worksheets for 1st Grade
These subtraction within 20 worksheets give parents and teachers focused, repeatable practice for 1st Grade learners. Use the relationship between addition and subtraction to subtract within 20. Choose a fixed-seed sample or make a fresh printable without creating an account.
Learning objective: Use the relationship between addition and subtraction to subtract within 20.
Reproducible fixed seeds
Three free worksheet samples
Open a sample to preview all questions, make a fresh version, or download the worksheet and answer key.
Subtraction Within 20
Sample 2 · Seed leaf-18-1-subtraction-within-20-sample-m3
1. 14 − 0 = ___
2. Find the difference: 19 − 15
3. Solve: ___ = 20 − 12
4. Find the difference: 15 − 0
Subtraction Within 20
Sample 3 · Seed leaf-18-1-subtraction-within-20-sample-z9
1. Solve: ___ = 19 − 17
2. Solve: ___ = 7 − 2
3. Solve: ___ = 8 − 6
4. 20 − 4 = ___
One fixed-seed example
How to approach this skill
Problem: 9 − 2 = ___
Answer: 7
Strategy: Identify the starting amount and the amount removed or compared before calculating the difference. This example supports the page objective: Use the relationship between addition and subtraction to subtract within 20.
How to use this worksheet
- Connect subtraction to missing-addend thinking as well as taking away. For this subtraction within 20 set, begin without a timer.
- Check selected answers by adding the difference to the subtrahend. Regenerate only when the learner is ready for another arrangement of the same objective.
Begin with the easy setting when the strategy is new, use standard for independent practice, and reserve challenge for a learner who can explain the method accurately.
Common mistakes to watch
- Subtracting the smaller digit from the larger digit regardless of position. Watch for this specifically during subtraction within 20 practice.
- Regrouping a ten without reducing the next place-value digit. Use the worked correction as the next teaching example.
Use the answer key to find a pattern, then ask the learner to explain one corrected example rather than repeating an entire set immediately.
Standards reference
Skill alignment
Alignment labels identify the primary skill practiced. A worksheet is supplemental practice and does not assess every part of a standard.
Planning help
Frequently asked questions
What does this 1st Grade Subtraction Within 20 worksheet practice?
Use the relationship between addition and subtraction to subtract within 20.
How should adults use the Subtraction Within 20 printable?
Start with one untimed set, review the learner's strategy, and use the answer key to discuss errors. Generate a new fixed-seed set only after the current skill is understood.
Does the Subtraction Within 20 download include answers?
Yes. The free PDF can include an appended answer key, or the answer key can be downloaded separately for adult use.
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