Here we will show you step-by-step how to calculate 12 plus 39 (12 + 39) using the Long Addition Method. We start by setting up our math problem as follows:
| 1 | 2 | |||||||
| + | 3 | 9 | ||||||
The next step is to add the ones digits together (2 + 9 = 11). Since the sum creates 1 tens digit, we put the 1 in the tens column, and the 1 at the bottom of the ones:
| 1 | ||||||||
| 1 | 2 | |||||||
| + | 3 | 9 | ||||||
| 1 |
Then in our final step, we add the tens digits together (including the 1 from the previous step): 1 + 3 + 1 = 5 and put that sum at the bottom:
| 1 | ||||||||
| 1 | 2 | |||||||
| + | 3 | 9 | ||||||
| 5 | 1 |
And that is how you solve 12 plus 39 using the Long Addition Method! The answer is displayed mathematically below:
12 + 39 = 51
Long Addition Calculator
Here you can enter another addition problem for us to explain and solve using the Long Addition Method: