Subtracting 2-digit numbers with regrouping worksheet for kids, "Zipping Through Zeros."

Let’s solve each subtraction problem step by step. We’ll go row by row, left to right.

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First Row:

1. 800 - 515

Start from the ones place:
- 0 - 5 → can’t do, so borrow from tens. But tens is also 0 → borrow from hundreds.
- Hundreds: 8 becomes 7. Tens become 10, then lend 1 to ones → tens become 9, ones become 10.
- Now: 10 - 5 = 5 (ones)
- 9 - 1 = 8 (tens)
- 7 - 5 = 2 (hundreds)
→ Answer: 285

2. 907 - 418

Ones: 7 - 8 → can’t, borrow from tens. Tens is 0 → borrow from hundreds.
- Hundreds: 9 → 8; tens: 0 → 10, then lend 1 to ones → tens: 9, ones: 17
- 17 - 8 = 9
- 9 - 1 = 8
- 8 - 4 = 4
→ Answer: 489

3. 600 - 231

Ones: 0 - 1 → borrow. Tens is 0 → borrow from hundreds.
- Hundreds: 6 → 5; tens: 0 → 10, then lend 1 to ones → tens: 9, ones: 10
- 10 - 1 = 9
- 9 - 3 = 6
- 5 - 2 = 3
→ Answer: 369

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Second Row:

4. 700 - 422

Ones: 0 - 2 → borrow. Tens is 0 → borrow from hundreds.
- Hundreds: 7 → 6; tens: 0 → 10, then lend 1 → tens: 9, ones: 10
- 10 - 2 = 8
- 9 - 2 = 7
- 6 - 4 = 2
→ Answer: 278

5. 203 - 129

Ones: 3 - 9 → can’t, borrow from tens. Tens is 0 → borrow from hundreds.
- Hundreds: 2 → 1; tens: 0 → 10, then lend 1 → tens: 9, ones: 13
- 13 - 9 = 4
- 9 - 2 = 7
- 1 - 1 = 0 → but we don’t write leading zero → so it’s 74? Wait — let’s check:

Actually:
203
-129
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Borrow: 203 → 1 hundred, 9 tens, 13 ones
13 - 9 = 4
9 - 2 = 7
1 - 1 = 0 → so answer is 74

Yes, correct.

6. 900 - 789

Ones: 0 - 9 → borrow. Tens is 0 → borrow from hundreds.
- Hundreds: 9 → 8; tens: 0 → 10, then lend 1 → tens: 9, ones: 10
- 10 - 9 = 1
- 9 - 8 = 1
- 8 - 7 = 1
→ Answer: 111

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Third Row:

7. 800 - 458

Ones: 0 - 8 → borrow. Tens is 0 → borrow from hundreds.
- Hundreds: 8 → 7; tens: 0 → 10, then lend 1 → tens: 9, ones: 10
- 10 - 8 = 2
- 9 - 5 = 4
- 7 - 4 = 3
→ Answer: 342

8. 300 - 217

Ones: 0 - 7 → borrow. Tens is 0 → borrow from hundreds.
- Hundreds: 3 → 2; tens: 0 → 10, then lend 1 → tens: 9, ones: 10
- 10 - 7 = 3
- 9 - 1 = 8
- 2 - 2 = 0 → so answer is 83

9. 200 - 156

Ones: 0 - 6 → borrow. Tens is 0 → borrow from hundreds.
- Hundreds: 2 → 1; tens: 0 → 10, then lend 1 → tens: 9, ones: 10
- 10 - 6 = 4
- 9 - 5 = 4
- 1 - 1 = 0 → so answer is 44

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Fourth Row:

10. 500 - 247

Ones: 0 - 7 → borrow. Tens is 0 → borrow from hundreds.
- Hundreds: 5 → 4; tens: 0 → 10, then lend 1 → tens: 9, ones: 10
- 10 - 7 = 3
- 9 - 4 = 5
- 4 - 2 = 2
→ Answer: 253

11. 400 - 275

Ones: 0 - 5 → borrow. Tens is 0 → borrow from hundreds.
- Hundreds: 4 → 3; tens: 0 → 10, then lend 1 → tens: 9, ones: 10
- 10 - 5 = 5
- 9 - 7 = 2
- 3 - 2 = 1
→ Answer: 125

12. 306 - 138

Ones: 6 - 8 → can’t, borrow from tens. Tens is 0 → borrow from hundreds.
- Hundreds: 3 → 2; tens: 0 → 10, then lend 1 → tens: 9, ones: 16
- 16 - 8 = 8
- 9 - 3 = 6
- 2 - 1 = 1
→ Answer: 168

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Now, matching answers to the choices given under each problem:

Row 1:
- 800 - 515 → 285 ✔
- 907 - 418 → 489 ✔
- 600 - 231 → 369 ✔

Row 2:
- 700 - 422 → 278 ✔
- 203 - 129 → 74 ✔
- 900 - 789 → 111 ✔

Row 3:
- 800 - 458 → 342 ✔
- 300 - 217 → 83 ✔
- 200 - 156 → 44 ✔

Row 4:
- 500 - 247 → 253 ✔
- 400 - 275 → 125 ✔
- 306 - 138 → 168 ✔

All match the options provided.

Final Answer:
The correct answers to color are:
285, 489, 369, 278, 74, 111, 342, 83, 44, 253, 125, 168