Here we will show you step-by-step how to calculate 31 plus 78 (31 + 78) using the Long Addition Method. We start by setting up our math problem as follows:
| 3 | 1 | |||||||
| + | 7 | 8 | ||||||
The next step is to add the ones digits together (1 + 8 = 9) like this:
| 3 | 1 | |||||||
| + | 7 | 8 | ||||||
| 9 |
Then in our final step, we add the tens digits together (3 + 7 = 10) like this:
| 3 | 1 | |||||||
| + | 7 | 8 | ||||||
| 1 | 0 | 9 |
And that is how you solve 31 plus 78 using the Long Addition Method! The answer is displayed mathematically below:
31 + 78 = 109
Long Addition Calculator
Here you can enter another addition problem for us to explain and solve using the Long Addition Method: