Let’s solve each subtraction problem step by step. We’ll subtract the bottom number from the top number, and then match the answer to the correct choice below each problem.
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Problem 1: 800 - 515
Start from the right:
- Ones: 0 - 5 → can’t do, borrow from tens. But tens is also 0, so borrow from hundreds.
- Hundreds: 8 becomes 7, tens become 10, then borrow 1 from tens → tens become 9, ones become 10.
- Now: 10 - 5 = 5 (ones)
- Tens: 9 - 1 = 8
- Hundreds: 7 - 5 = 2
→ Answer:
285
Check options: 285, 275, 315 →
✔ 285 is correct.
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Problem 2: 907 - 418
Ones: 7 - 8 → can’t do, borrow from tens. Tens is 0, so borrow from hundreds.
- Hundreds: 9 → 8, tens → 10, then borrow 1 → tens → 9, ones → 17
- 17 - 8 = 9
- Tens: 9 - 1 = 8
- Hundreds: 8 - 4 = 4
→ Answer:
489
Check options: 288, 489, 389 →
✔ 489 is correct.
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Problem 3: 600 - 231
Ones: 0 - 1 → borrow. Tens is 0, so borrow from hundreds.
- Hundreds: 6 → 5, tens → 10, then borrow 1 → tens → 9, ones → 10
- 10 - 1 = 9
- Tens: 9 - 3 = 6
- Hundreds: 5 - 2 = 3
→ Answer:
369
Check options: 431, 229, 369 →
✔ 369 is correct.
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Problem 4: 700 - 422
Ones: 0 - 2 → borrow. Tens is 0, borrow from hundreds.
- Hundreds: 7 → 6, tens → 10, then borrow 1 → tens → 9, ones → 10
- 10 - 2 = 8
- Tens: 9 - 2 = 7
- Hundreds: 6 - 4 = 2
→ Answer:
278
Check options: 288, 278, 378 →
✔ 278 is correct.
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Problem 5: 203 - 129
Ones: 3 - 9 → borrow from tens. Tens is 0, so borrow from hundreds.
- Hundreds: 2 → 1, tens → 10, then borrow 1 → tens → 9, ones → 13
- 13 - 9 = 4
- Tens: 9 - 2 = 7
- Hundreds: 1 - 1 = 0
→ Answer:
74
Check options: 74, 175, 126 →
✔ 74 is correct.
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Problem 6: 900 - 789
Ones: 0 - 9 → borrow. Tens is 0, borrow from hundreds.
- Hundreds: 9 → 8, tens → 10, then borrow 1 → tens → 9, ones → 10
- 10 - 9 = 1
- Tens: 9 - 8 = 1
- Hundreds: 8 - 7 = 1
→ Answer:
111
Check options: 211, 275, 111 →
✔ 111 is correct.
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Problem 7: 800 - 458
Ones: 0 - 8 → borrow. Tens is 0, borrow from hundreds.
- Hundreds: 8 → 7, tens → 10, then borrow 1 → tens → 9, ones → 10
- 10 - 8 = 2
- Tens: 9 - 5 = 4
- Hundreds: 7 - 4 = 3
→ Answer:
342
Check options: 242, 224, 342 →
✔ 342 is correct.
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Problem 8: 300 - 217
Ones: 0 - 7 → borrow. Tens is 0, borrow from hundreds.
- Hundreds: 3 → 2, tens → 10, then borrow 1 → tens → 9, ones → 10
- 10 - 7 = 3
- Tens: 9 - 1 = 8
- Hundreds: 2 - 2 = 0
→ Answer:
83
Check options: 83, 833, 183 →
✔ 83 is correct.
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Problem 9: 200 - 156
Ones: 0 - 6 → borrow. Tens is 0, borrow from hundreds.
- Hundreds: 2 → 1, tens → 10, then borrow 1 → tens → 9, ones → 10
- 10 - 6 = 4
- Tens: 9 - 5 = 4
- Hundreds: 1 - 1 = 0
→ Answer:
44
Check options: 143, 144, 44 →
✔ 44 is correct.
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Problem 10: 500 - 247
Ones: 0 - 7 → borrow. Tens is 0, borrow from hundreds.
- Hundreds: 5 → 4, tens → 10, then borrow 1 → tens → 9, ones → 10
- 10 - 7 = 3
- Tens: 9 - 4 = 5
- Hundreds: 4 - 2 = 2
→ Answer:
253
Check options: 253, 255, 315 →
✔ 253 is correct.
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Problem 11: 400 - 275
Ones: 0 - 5 → borrow. Tens is 0, borrow from hundreds.
- Hundreds: 4 → 3, tens → 10, then borrow 1 → tens → 9, ones → 10
- 10 - 5 = 5
- Tens: 9 - 7 = 2
- Hundreds: 3 - 2 = 1
→ Answer:
125
Check options: 125, 225, 325 →
✔ 125 is correct.
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Problem 12: 306 - 138
Ones: 6 - 8 → borrow from tens.
- Tens: 0 → borrow from hundreds. Hundreds: 3 → 2, tens → 10, then borrow 1 → tens → 9, ones → 16
- 16 - 8 = 8
- Tens: 9 - 3 = 6
- Hundreds: 2 - 1 = 1
→ Answer:
168
Check options: 262, 168, 385 →
✔ 168 is correct.
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Final Answer:
285, 489, 369, 278, 74, 111, 342, 83, 44, 253, 125, 168
Parent Tip: Review the logic above to help your child master the concept of subtracting zeros worksheet 3rd.
