Here we will show you step-by-step how to calculate 21 plus 18 (21 + 18) using the Long Addition Method. We start by setting up our math problem as follows:
| 2 | 1 | |||||||
| + | 1 | 8 | ||||||
The next step is to add the ones digits together (1 + 8 = 9) like this:
| 2 | 1 | |||||||
| + | 1 | 8 | ||||||
| 9 |
Then in our final step, we add the tens digits together (2 + 1 = 3) like this:
| 2 | 1 | |||||||
| + | 1 | 8 | ||||||
| 3 | 9 |
And that is how you solve 21 plus 18 using the Long Addition Method! The answer is displayed mathematically below:
21 + 18 = 39
Long Addition Calculator
Here you can enter another addition problem for us to explain and solve using the Long Addition Method: