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

27.2 x 0.5 =

13.6

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

BONUS! 1,500 POINTS :)

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

BONUS! DOUBLE POINTS

8.76 x 8 = 70.08

There is no error!

Multiplying two digit numbers

100

26 x 42 = 

1,092

200

62 x 34=

2,108

300

51 x 33=

1,683

400

82 x 59

4,838

500

BONUS!!! DOUBLE POINTS

0.25 x (10 to the 3rd power) =

250

Multiply by a whole number

100

9.2 x 39 =

358.8

200

3.05 x 26 =

79.3

300

8.3 x 62 =

516.6

400

5.5 x 19 =

104.5

500

4.5 x 89 =

400.5