Dividing DecimalsDividing Decimals

This presentation will show This presentation will show you how to set up and you how to set up and

perform a decimal division perform a decimal division problem.problem.

18.146 ÷ 2.1518.146 ÷ 2.15

2.15 18.146You can’t divide by a decimal so you have to move the decimal in the divisor all the way to the right.

Look at the divisorLook at the divisor

215. 18.146

Do we need to keep the decimal behind the number or can we just assume it is there?

Now we have to move the Now we have to move the decimal in the dividenddecimal in the dividend

We need to move the decimal the same number of spaces and in the same direction for the dividend to keep everything the same.

215 1814.6

Now we are ready to divideNow we are ready to divide

215 1814.6

How many times does 215 go into 1814?

What’s your first guess?

Try something like 8 or 9 because 2 x 8 or 2 x 9 will get you close to 18.

Continuing onContinuing on

215 1814.68

8 x 215 is 1720

1 7 2 0

9 4

Placing the decimal in the Placing the decimal in the answeranswer

215 1814.68 .

1 7 2 0

9 4 6

The decimal goes directly above the decimal in the dividend

Notice that we’ve dropped the 6 down.

Continuing on againContinuing on again

8 . 4

1 7 2 0

9 4 68 6 0

8 6 0

You must add a zero on to the dividend to finish

215 1814.60

And finishAnd finish

8 . 4 4

1 7 2 0

9 4 68 6 0

8 6 08 6 0

215 1814.60

0

►So, 18.146 ÷ 2.15 is 8.44So, 18.146 ÷ 2.15 is 8.44

2.15 18.1468 . 4 4