### The numbers addition to perform:

48 + 85

#### 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.

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

### Add the digits in the ones column:

#### 8 + 5 = 13

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

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

#### 8 + 5 =

#### break into component parts: 8 + 5 =

#### 8 + 2 + 3 =

#### group by 2: 8 + 2 + 3 =

#### 10 + 3 =

#### 13

#### 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: 13.

#### 3 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:

#### 4 + 8 + 1 = 13

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

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

#### 4 + 8 + 1 =

#### add marked digits: 4 + 8 + 1 =

#### (4 + 1) + 8 =

#### 5 + 8 =

#### break into component parts: 5 + 8 =

#### 2 + 3 + 8 =

#### group by 2: 2 + 3 + 8 =

#### (2 + 8) + 3 =

#### 10 + 3 =

#### 13

#### 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: 13.

#### 3 is the tens digit.

Write it down at the base of the tens column.

#### 1 is the hundreds digit.

Since there is no hundreds column...

Write it down at the base, next to the tens digit.

### Answer:

48 + 85 = 133