# Add the numbers: 1,001 + 9,339 + 2,121 = ? Calculate the natural numbers sum and learn how to do the addition, column adding method, from right to left

## The numbers addition to perform: 1,001 + 9,339 + 2,121

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

#### And so on...

 1 0 0 1 9 3 3 9 + 2 1 2 1 ?

## 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 0 0 1 9 3 3 9 + 2 1 2 1 1

### Add the digits in the tens column:

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

 1 1 0 0 1 9 3 3 9 + 2 1 2 1 6 1

### Add the digits in the hundreds column:

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

 1 1 0 0 1 9 3 3 9 + 2 1 2 1 4 6 1

### Add the digits in the thousands column:

#### 1 is the ten thousands digit. Write it down at the base, next to the thousands digit.

 1 1 0 0 1 9 3 3 9 + 2 1 2 1 1 2 4 6 1