How_To_Be_Good_At_Math

CALCULATING • COLUMN ADDITION 87

First, write the larger

number above the smaller

number, making sure to line

up the decimal points. Add

another decimal point on the

bottom row. If you need to,

label the columns to show

the place value of each.

So, 4368 + 2795 = 7163

Now we add 7 hundreds to

3 hundreds. The answer is

10 hundreds. Add on the 1 hundred we

carried over to make 11 hundreds. Write

a 1 in the hundreds column and carry

the other 1 to the thousands column.

4368 + 2795 = 7163

Adding decimals

We add decimals in the same way as we add whole numbers –

we just make sure that digits of the same value are lined up

underneath each other. Let’s add 38.92 and 5.89.

Finally, we can add the thousands.

Add 2 thousands to 4 thousands.

The answer is 6 thousands. Add on

the 1 thousand carried over to make

7 thousands. Write the 7 in the

thousands column.

Now we can find the

total just as we do with

whole numbers.

So, 38.92 + 5.89 = 44.81

Add the carried

1 hundred to the

10 hundreds to

make 11 hundreds

The total of the

numbers in the

thousands column

is less than 10,

so we don't carry

any numbers

TRY IT OUT

Can you do it?

Now you've seen how to do

column addition, can you use it

for these sums?

Answers on page 319

45.36 + 26.48 =?

7413 + 1781 =?

1639 + 6517 =?

Th H T O

Th H T O

O

• 2795

4368

163

• 2795

4368

7163

1

1

• 89

92

11

11

5

38.

.

T 101 1001

.

• 89

92

5

38.

.

44.^81

1 1

OT 101 1001

086_087_Column_addition.indd 87 29/02/2016 18:02