Let’s solve each subtraction problem step by step. We’re subtracting 2-digit or 3-digit numbers, and some need regrouping (borrowing). I’ll go one by one.
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Problem 1: 800 - 515
Start from the right:
- Ones place: 0 - 5 → can’t do, so borrow from tens. But tens is also 0! So we borrow from hundreds.
→ 800 becomes 7 hundreds, 9 tens, 10 ones.
Now: 10 - 5 = 5
Tens: 9 - 1 = 8
Hundreds: 7 - 5 = 2
Answer:
285
Check options: 285, 275, 315 → correct is
285
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Problem 2: 907 - 418
Ones: 7 - 8 → can’t, borrow from tens. Tens is 0 → borrow from hundreds.
→ 907 becomes 8 hundreds, 9 tens, 17 ones.
Ones: 17 - 8 = 9
Tens: 9 - 1 = 8
Hundreds: 8 - 4 = 4
Answer:
489
Options: 288, 489, 389 → correct is
489
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Problem 3: 600 - 231
Ones: 0 - 1 → borrow. Tens is 0 → borrow from hundreds.
→ 600 becomes 5 hundreds, 9 tens, 10 ones.
Ones: 10 - 1 = 9
Tens: 9 - 3 = 6
Hundreds: 5 - 2 = 3
Answer:
369
Options: 431, 229, 369 → correct is
369
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Problem 4: 700 - 422
Ones: 0 - 2 → borrow. Tens is 0 → borrow from hundreds.
→ 700 becomes 6 hundreds, 9 tens, 10 ones.
Ones: 10 - 2 = 8
Tens: 9 - 2 = 7
Hundreds: 6 - 4 = 2
Answer:
278
Options: 288, 278, 378 → correct is
278
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Problem 5: 203 - 129
Ones: 3 - 9 → can’t, borrow from tens. Tens is 0 → borrow from hundreds.
→ 203 becomes 1 hundred, 9 tens, 13 ones.
Ones: 13 - 9 = 4
Tens: 9 - 2 = 7
Hundreds: 1 - 1 = 0 → so answer is 74
Answer:
74
Options: 74, 175, 126 → correct is
74
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Problem 6: 900 - 789
Ones: 0 - 9 → borrow. Tens is 0 → borrow from hundreds.
→ 900 becomes 8 hundreds, 9 tens, 10 ones.
Ones: 10 - 9 = 1
Tens: 9 - 8 = 1
Hundreds: 8 - 7 = 1
Answer:
111
Options: 211, 275, 111 → correct is
111
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Problem 7: 800 - 458
Ones: 0 - 8 → borrow. Tens is 0 → borrow from hundreds.
→ 800 becomes 7 hundreds, 9 tens, 10 ones.
Ones: 10 - 8 = 2
Tens: 9 - 5 = 4
Hundreds: 7 - 4 = 3
Answer:
342
Options: 242, 224, 342 → correct is
342
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Problem 8: 300 - 217
Ones: 0 - 7 → borrow. Tens is 0 → borrow from hundreds.
→ 300 becomes 2 hundreds, 9 tens, 10 ones.
Ones: 10 - 7 = 3
Tens: 9 - 1 = 8
Hundreds: 2 - 2 = 0 → so answer is 83
Answer:
83
Options: 83, 833, 183 → correct is
83
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Problem 9: 200 - 156
Ones: 0 - 6 → borrow. Tens is 0 → borrow from hundreds.
→ 200 becomes 1 hundred, 9 tens, 10 ones.
Ones: 10 - 6 = 4
Tens: 9 - 5 = 4
Hundreds: 1 - 1 = 0 → so answer is 44
Answer:
44
Options: 143, 144, 44 → correct is
44
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Problem 10: 500 - 247
Ones: 0 - 7 → borrow. Tens is 0 → borrow from hundreds.
→ 500 becomes 4 hundreds, 9 tens, 10 ones.
Ones: 10 - 7 = 3
Tens: 9 - 4 = 5
Hundreds: 4 - 2 = 2
Answer:
253
Options: 253, 255, 315 → correct is
253
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Problem 11: 400 - 275
Ones: 0 - 5 → borrow. Tens is 0 → borrow from hundreds.
→ 400 becomes 3 hundreds, 9 tens, 10 ones.
Ones: 10 - 5 = 5
Tens: 9 - 7 = 2
Hundreds: 3 - 2 = 1
Answer:
125
Options: 125, 225, 325 → correct is
125
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Problem 12: 306 - 138
Ones: 6 - 8 → can’t, borrow from tens. Tens is 0 → borrow from hundreds.
→ 306 becomes 2 hundreds, 9 tens, 16 ones.
Ones: 16 - 8 = 8
Tens: 9 - 3 = 6
Hundreds: 2 - 1 = 1
Answer:
168
Options: 262, 168, 385 → correct is
168
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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 subtraction with regrouping across zeros worksheet.
