Subtraction with Regrouping: 517 − 128
Subtraction with Regrouping Calculator
What is 517 − 128?
Answer
517 − 128 =
389
With regrouping: 2 borrows — from the tens and the hundreds
| 4 | 10 | +10 | |
| 7 (was 7, now 17) | |||
| − | 1 | 2 | 8 |
| 3 | 8 | 9 |
Column by column: 517 − 128
- Ones: 7 is less than 8 — borrow 1 ten: tens 1 → 0; 17 − 8 = 9 — write 9.
- Tens: after borrowing, 0; 0 is less than 2 — borrow 1 hundred: hundreds 5 → 4; 10 − 2 = 8 — write 8.
- Hundreds: after borrowing, 4; 4 − 1 = 3 — write 3.
517 − 128 = 389
Second check: 517 − 389 = 128
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See Also
- Addition with Regrouping Calculator - Column addition step by step, with every carry
- Long Division Calculator - Step-by-step long division with detailed explanation
- Long Multiplication Calculator - Column multiplication with partial products, step by step
- Subtracting Fractions Calculator - Subtract fractions, mixed numbers and whole numbers step by step
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