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Subtraction within 20 — Easy Worksheet 2
Grade 1 · MathSheets Name: ____________________ Date: __________
Answer each question. The same facts come in different shapes!
How to solve
Start at the first number and count back the second number. Or ask yourself: what do I add to the second number to reach the first?
Example
4 − 1 = ___
Answer: 3
Warm-up
Not quite. The answer is
💡 Start at 7 and count back 3: 6, 5, 4. So 7 − 3 = 4.
✓ Correct!
Not quite. The answer is
💡 Start at 7 and count back 3: 6, 5, 4. So 7 − 3 = 4.
💡 How to solve: Subtraction within 20
Start at the first number and count back the second number. Or ask yourself: what do I add to the second number to reach the first?
Try a similar one
9 − 0 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Think addition: 7 + ? = 8. 7 + 1 = 8, so 8 − 7 = 1.
✓ Correct!
Not quite. The answer is
💡 Think addition: 7 + ? = 8. 7 + 1 = 8, so 8 − 7 = 1.
💡 How to solve: Subtraction within 20
Start at the first number and count back the second number. Or ask yourself: what do I add to the second number to reach the first?
Try a similar one
5 − 4 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Think addition: 5 + ? = 8. 5 + 3 = 8, so 8 − 5 = 3.
✓ Correct!
Not quite. The answer is
💡 Think addition: 5 + ? = 8. 5 + 3 = 8, so 8 − 5 = 3.
💡 How to solve: Subtraction within 20
Start at the first number and count back the second number. Or ask yourself: what do I add to the second number to reach the first?
Try a similar one
5 − 3 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Picture it
Not quite. The answer is
💡 2 of the 6 are taken away. Count the ones that are left: 4. So 6 − 2 = 4.
✓ Correct!
Not quite. The answer is
💡 2 of the 6 are taken away. Count the ones that are left: 4. So 6 − 2 = 4.
💡 How to solve: Subtraction within 20
Start at the first number and count back the second number. Or ask yourself: what do I add to the second number to reach the first?
Try a similar one
10 − 5 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 The whole is 8 and one part is 2. The other part is 8 − 2. Start at 8 and count back 2: 7, 6. So 8 − 2 = 6.
✓ Correct!
Not quite. The answer is
💡 The whole is 8 and one part is 2. The other part is 8 − 2. Start at 8 and count back 2: 7, 6. So 8 − 2 = 6.
💡 How to solve: Subtraction within 20
Start at the first number and count back the second number. Or ask yourself: what do I add to the second number to reach the first?
Try a similar one
8 − 0 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Think it through
Not quite. The answer is
💡 1 + 2 = 3, so 3 − 1 = 2.
✓ Correct!
Not quite. The answer is
💡 1 + 2 = 3, so 3 − 1 = 2.
💡 How to solve: Subtraction within 20
Start at the first number and count back the second number. Or ask yourself: what do I add to the second number to reach the first?
Try a similar one
1 − 0 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Count up from 1 to 5: that is 4. Check: 5 − 4 = 1.
✓ Correct!
Not quite. The answer is
💡 Count up from 1 to 5: that is 4. Check: 5 − 4 = 1.
💡 How to solve: Subtraction within 20
Start at the first number and count back the second number. Or ask yourself: what do I add to the second number to reach the first?
Try a similar one
1 − 0 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Add back what was taken away: 7 + 1 = 8. Check: 8 − 1 = 7.
✓ Correct!
Not quite. The answer is
💡 Add back what was taken away: 7 + 1 = 8. Check: 8 − 1 = 7.
💡 How to solve: Subtraction within 20
Start at the first number and count back the second number. Or ask yourself: what do I add to the second number to reach the first?
Try a similar one
6 − 0 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Giving away means take away. Start at 5 and count back 1: 4. So 5 − 1 = 4.
✓ Correct!
Not quite. The answer is
💡 Giving away means take away. Start at 5 and count back 1: 4. So 5 − 1 = 4.
💡 How to solve: Subtraction within 20
Start at the first number and count back the second number. Or ask yourself: what do I add to the second number to reach the first?
Try a similar one
2 − 1 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Challenge
Not quite. The answer is
💡 8 − 1 = 7. 10 is 2 more than 8, so take away 2 more too: 1 + 2 = 3. Check: 10 − 3 = 7.
✓ Correct!
Not quite. The answer is
💡 8 − 1 = 7. 10 is 2 more than 8, so take away 2 more too: 1 + 2 = 3. Check: 10 − 3 = 7.
💡 How to solve: Subtraction within 20
Start at the first number and count back the second number. Or ask yourself: what do I add to the second number to reach the first?
Try a similar one
4 − 0 = ___
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
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Subtraction within 20 — Easy Worksheet 2
Answer each question. The same facts come in different shapes!