# What is Column Addition?

Tiffany likes maths and loves to learn how to calculate. She likes to wear her numbers dress when she is learning maths.

Tiffany has been learning column addition

Did you know?

Column addition is very useful if you need to add two or more numbers together and you are unable to use mental addition

To do column addition correctly it is important that you understand place value and put each number in the correct column

### Adding numbers using column addition

#### Simple Column Addition

Our sum is 24 + 35

The number 24 has 2 tens and 4 ones, the number 35 has 3 tens and 5 ones

In order to add these together we have to put them in columns with the tens in one column and the ones in another.

Add the two numbers in the ones column first. 4 + 5 = 9 so the number 9 is placed in the = and in the ones column.

Next add the two numbers in the tens column. 2 + 3 = 5 so the number 5 is placed in the = and in the tens column.

The answer is 5 tens and 9 units or 59

#### Column Addition with Regrouping (Carrying)

Our sum is 38 + 45

The number 38 has 3 tens and 8 ones, the number 45 has 4 tens and 5 ones

In order to add these together we have to put them in columns with the tens in one column and the ones in another.

When you add the numbers in the ones column, the answer is 13.

13 is a higher number than 9 and is made up of 1 ten and 3 ones. So we put the number 3 in the = and in the ones column. We then regroup the 1 ten by placing it in the tens column below the =. When adding the digits in the tens column remember to add in the regrouped 1 ten.

The following image shows how regrouping works with bigger numbers and multiple regroupings.

Tiffany has learned enjoyed learning about column addition. She summed up her learning with the following keywords:

addition, carrying, column, equals, hundreds, ones, place value, regrouping, tens