# Add the numbers: 123 + 215 + 7,517 = ? Calculate the natural numbers sum and learn how to do the addition, column adding method, from right to left

## The numbers addition to perform: 123 + 215 + 7,517

### Stack the numbers on top of each other.

#### And so on...

 1 2 3 2 1 5 + 7 5 1 7 ?

## Add column by column; start from the column on the right.

### Add the digits in the ones column:

#### 1 is the tens digit. Carry it over to the tens column. Write the digit above that column. Add it with the rest of the digits in that column.

 1 1 2 3 2 1 5 + 7 5 1 7 5

### Add the digits in the tens column:

#### 5 is the tens digit. Write it down at the base of the tens column.

 1 1 2 3 2 1 5 + 7 5 1 7 5 5

### Add the digits in the hundreds column:

#### 8 is the hundreds digit. Write it down at the base of the hundreds column.

 1 1 2 3 2 1 5 + 7 5 1 7 8 5 5

### Add the digits in the thousands column:

#### 7 is the thousands digit. Write it down at the base of the thousands column.

 1 1 2 3 2 1 5 + 7 5 1 7 7 8 5 5