work it out

You are asked to solve a few problems and determine a trick that can be used to divide a

decimal by a decimal. By solving these problems with a calculator you quickly see a

pattern to make an easy way to always divide. Explain that pattern and the new “trick” your

peers can use for it. 1)

2)

Work It Out

.05 .75

5. 75.

Ideas?

When the divisor is a

decimal, move the decimal point to the right in the

divisor until it becomes a whole number.

574.25. 574..25

574..25

The number of places you moved the decimal in the divisor, move the decimal

the same number of places in the dividend.

5.74.25

After moving the decimals in both the divisor and dividend, this is your new division problem.

5.74.25574.25.

Now let’s divide. Bring the decimal straight up into the

quotient.

5.74.25 .

Then divide.

5.74.25 1.

25

Subtract and bring down the next

number.

5.74.25 1.

25 225

Finish dividing the problem.

5.74.25 1.9

25 225 225 0

Why does this work?

Quick!

Let’s try another

example.

441.2.1

Move the decimal point to the right in the divisor until it becomes a whole number.

441.2.1

441..12

Move the decimal the same number of places in the dividend.

441..12

44.1.12

After moving the decimals in both the divisor and dividend, this is

your new division problem.

44.1.12144.2.1

.

Bring the decimal point straight up into the quotient.

44.1.12

.1

1 2

Let’s divide!

44.1.12

.1

1 2 24

Subtract and bring down.

44.1.12

.1 2

1 2 24 24

0

Finish dividing.

44.1.12

1)

2)

3)

4)

Now let’s try some on your own!

474.6

5.895

21.922.3

8912.95.

1) .0792) 19.73) 9.14) .22

Answers

Work it out in a race!!!

Let’s split!

Agendas: PB pg 21# 1-9 Choose 4, # 10 and

11

After a while crocodile