Subtraction with Regrouping: 315 − 128
Subtraction with Regrouping Calculator
What is 315 − 128?
Answer
315 − 128 =
187
With regrouping: 2 borrows — from the tens and the hundreds
| 2 | 10 | +10 | |
| 5 (was 5, now 15) | |||
| − | 1 | 2 | 8 |
| 1 | 8 | 7 |
Column by column: 315 − 128
- Ones: 5 is less than 8 — borrow 1 ten: tens 1 → 0; 15 − 8 = 7 — write 7.
- Tens: after borrowing, 0; 0 is less than 2 — borrow 1 hundred: hundreds 3 → 2; 10 − 2 = 8 — write 8.
- Hundreds: after borrowing, 2; 2 − 1 = 1 — write 1.
315 − 128 = 187
Second check: 315 − 187 = 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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