Multiplying Decimals

Find the Product

100

4.1 x 0.5 = 

2.05

200

1.1 x 2.2 =

2.42

300

82.1 x 0.3 =

24.63

400

92.1 x 0.2

18.42

500

27.23 x 0.55 =

14.9765

Steps

100

What is Step 1 to multiplying decimals?

Rewrite the problem without the decimals in it.

200

What is Step 2 to multiplying decimals?

Multiply like normal

300

What is Step 3 to multiplying decimals?

Count the number of decimal places in BOTH factors.

400

What is the last step to multiplying decimals?

Put your decimal point back in the answer 

500

List all the steps to multiplying decimals. (Hint: there are 4 steps)

Step 1: Rewrite the problem without the decimals

Step 2: Multiply like normal

Step 3: Count the number of decimal places in both factors

Step 4: Put your decimal point back in

Find the Mistake

100

2.21 x 3 = 6.61

6.63

200

4.32 x 3 = 10.96

12.96

300

5.64 x 4 = 22.46

22.56

400

6.75 x 5 = 30.75

33.75

500

8.76 x 8 = 70.08

There is no error!

Powers of Ten

100

0.752 x 10 = 

7.52

200

11.6 x 10²=

1,160

300

6 x 10⁵

600,000

400

0.032 x ____= 3.2

100 or 10²

500

_______ x 0.013 = 13,000

1,000,000 or 10⁶

Multiply by a whole number

100

9.2 x 39 =

358.8

200

3.05 x 26 =

79.3

300

8.39 x 62 =

520.18

400

5.052 x 19 =

95.988

500

14.55 x 89 =

1294.95