Addition with Regrouping: 78 + 39
Addition with Regrouping Calculator
What is 78 + 39?
Answer
78 + 39 =
117
The sum is longer than the addends: 2 carries — into the tens and the hundreds; the last one makes a new digit
| 1carry | 1carry | ||
| 7 | 8 | ||
| + | 3 | 9 | |
| 1 | 1 | 7 |
Column by column: 78 + 39
- Ones: 8 + 9 = 17 — write 7, carry 1.
- Tens: 7 + 3 + 1 = 11 — write 1, carry 1.
- Hundreds: the carried 1 — write 1.
78 + 39 = 117
Second check: 117 − 78 = 39
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- Subtraction with Regrouping Calculator - Column subtraction step by step, with borrowing across zeros
- Long Multiplication Calculator - Column multiplication with partial products, step by step
- Long Division Calculator - Step-by-step long division with detailed explanation
- Adding Fractions Calculator - Add fractions, mixed numbers and whole numbers step by step
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