Here we will show you step-by-step how to calculate 78 plus 39 (78 + 39) using the Long Addition Method. We start by setting up our math problem as follows:
| 7 | 8 | |||||||
| + | 3 | 9 | ||||||
The next step is to add the ones digits together (8 + 9 = 17). Since the sum creates 1 tens digit, we put the 1 in the tens column, and the 7 at the bottom of the ones:
| 1 | ||||||||
| 7 | 8 | |||||||
| + | 3 | 9 | ||||||
| 7 |
Then in our final step, we add the tens digits together (including the 1 from the previous step): 7 + 3 + 1 = 11 and put that sum at the bottom:
| 1 | ||||||||
| 7 | 8 | |||||||
| + | 3 | 9 | ||||||
| 1 | 1 | 7 |
And that is how you solve 78 plus 39 using the Long Addition Method! The answer is displayed mathematically below:
78 + 39 = 117
Long Addition Calculator
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