Let’s solve each subtraction problem step by step. Remember, when subtracting across zeros, we need to borrow carefully — sometimes from more than one place!
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Problem 1: 601 - 346
Start from the right (ones place):
- Ones: 1 - 6 → Can’t do it! Borrow from tens.
- But tens digit is 0 → So go to hundreds.
- Hundreds: 6 becomes 5. Tens become 10.
- Now borrow 1 from tens for ones: tens become 9, ones become 11.
- Ones: 11 - 6 = 5
- Tens: 9 - 4 = 5
- Hundreds: 5 - 3 = 2
✔ Answer:
255
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Problem 2: 400 - 235
Ones: 0 - 5 → Need to borrow.
Tens is 0 → Go to hundreds.
Hundreds: 4 becomes 3. Tens become 10.
Now borrow 1 from tens for ones: tens become 9, ones become 10.
Ones: 10 - 5 = 5
Tens: 9 - 3 = 6
Hundreds: 3 - 2 = 1
✔ Answer:
165
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Problem 3: 500 - 234
Same idea.
Ones: 0 - 4 → borrow.
Tens is 0 → borrow from hundreds.
Hundreds: 5 → 4. Tens: 10 → then lend 1 to ones → tens = 9, ones = 10.
Ones: 10 - 4 = 6
Tens: 9 - 3 = 6
Hundreds: 4 - 2 = 2
✔ Answer:
266
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Problem 4: 400 - 322
Ones: 0 - 2 → borrow.
Tens is 0 → borrow from hundreds.
Hundreds: 4 → 3. Tens: 10 → lend 1 → tens = 9, ones = 10.
Ones: 10 - 2 = 8
Tens: 9 - 2 = 7
Hundreds: 3 - 3 = 0 → don’t write leading zero.
✔ Answer:
78
Wait — that can’t be right? Let me check again.
Actually, 400 - 322:
After borrowing:
Hundreds: 3
Tens: 9
Ones: 10
So:
Ones: 10 - 2 = 8
Tens: 9 - 2 = 7
Hundreds: 3 - 3 = 0 → so answer is 78? That seems too small.
Wait — 400 - 322 should be 78? Let me verify with addition: 322 + 78 = 400 → yes, correct.
But let’s double-check the borrowing:
Original: 400
Borrow: 3 | 9 | 10
Subtract: 3 | 2 | 2
Result: 0 | 7 | 8 → which is 78.
Yes, correct.
✔ Answer:
78
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Problem 5: 300 - 153
Ones: 0 - 3 → borrow.
Tens is 0 → borrow from hundreds.
Hundreds: 3 → 2. Tens: 10 → lend 1 → tens = 9, ones = 10.
Ones: 10 - 3 = 7
Tens: 9 - 5 = 4
Hundreds: 2 - 1 = 1
✔ Answer:
147
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Problem 6: 900 - 346
Ones: 0 - 6 → borrow.
Tens is 0 → borrow from hundreds.
Hundreds: 9 → 8. Tens: 10 → lend 1 → tens = 9, ones = 10.
Ones: 10 - 6 = 4
Tens: 9 - 4 = 5
Hundreds: 8 - 3 = 5
✔ Answer:
554
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Final Answers:
601 - 346 =
255
400 - 235 =
165
500 - 234 =
266
400 - 322 =
78
300 - 153 =
147
900 - 346 =
554
Final Answer:
255, 165, 266, 78, 147, 554
Parent Tip: Review the logic above to help your child master the concept of 3rd grade subtraction across zeros worksheet.
