# Add the numbers: 70 + 106 + 109 = ? Calculate the natural numbers sum and learn how to do the addition, column adding method, from right to left

## The numbers addition to perform:

70 + 106 + 109

#### Method used below: column adding, from right to left (traditional).

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

#### The ones digits line up in the first column from the right.

#### The tens digits line up in the next column to the left.

#### And so on...

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

### Add the digits in the ones column:

#### 0 + 6 + 9 = 15

#### How did we add the digits? Explanation below.

#### Group the ones together in order to make tens:

#### 0 + 6 + 9 =

#### 6 + 9 =

#### 1 + 5 + 9 =

#### 1 + 5 + 9 =

#### (1 + 9) + 5 =

#### 10 + 5 =

#### 15

#### Change the order in which the numbers are added, the sum stays the same.

Break some number(s) into component parts, the sum stays the same.

#### The sum is a two-digit number: 15.

#### 5 is the ones digit.

Write it down at the base of 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.

### Add the digits in the tens column:

#### 7 + 0 + 0 + 1 = 8

#### 8 is the tens digit.

Write it down at the base of the tens column.

### Add the digits in the hundreds column:

#### 1 + 1 = 2

#### 2 is the hundreds digit.

Write it down at the base of the hundreds column.

## Answer:

## 70 + 106 + 109 = 285

## Addition Calculator: Add Numbers & Learn to Calculate the Sum

#### 1. Stack the numbers on top of each other. 2. Add column by column starting from the column on the right.

## The latest numbers that were added