Multiplying Decimals

Whole Number x Decimal

100

5 x .04

0.2

200

6 x .5

3

300

.3 x 23

6.9

400

42 x 2.2

92.4

500

79 x 7.23

517.17

Whole Number x Decimal Part 2

100

27 x 0.8

21.6

200

45 x 4.6

207

300

62 x .003

0.186

400

.038 x 32

1.216

500

Michelle bought 4.6 meters of fabric. Each meter costs $3.50. How much did she spend?

$16.10 

Decimal x Decimal

100

.5 x .25

0.125

200

0.3 x 0.5

0.15

300

.23 x .3

0.069

400

.730 x .120

0.0876

500

2.12 x 2.12

4.4944

Decimal x 10's

100

Finish the pattern

10 x .5=5

100x.5=50

1000x.5=

500

200

If you are multiplying 3.24 x 100 which direction do you move the decimal point and how many jumps will it take? What is the product?

2 jumps to the right (towards the window) The answer is 324

300

Look at board for clue. 

(237 x 1 hundredth as a fraction)

2.37

400

10³ x 5.78

5,780

500

How many jumps and in which direction is the following problem?

1/1000 x 3,745

What is the product? Explain your answer

3 jumps to the left 3.745

Misc

100

True Or False: When multiplying decimals I have to line them up first, then multiply.

False

200

True Or False: after multiplying decimals, I move the decimal point from right to left

True

300

What is .5 written as a fraction? 

¹/₂

400

Natalie likes to mail a lot of post cards when she goes on vacation. in 2014, the cost of a postcard stamp was $0.34. If she buys 10 postcard stamps what is the total cost of the stamps? 

$3.40

500

Alyssa is painting 3 of the walls in her studio blue. Each of the walls are 8.3 feet tall and 7.5 feet wide. Find the area of the room. 

A=LengthxWidth

62.25