Decimal Multiplication

Multiply Decimals

100

What is 1.2 x 2

2.4

200

What is 1.5 x 3

4.5

300

What is 2.5 x 10

25

400

What is 2.1 x 56

117.6

500

What is 1.2 x 30

36

Multiply Decimals

100

What is 24 x 0.1

2.4

200

What is 2.3 x 5

11.5

300

What is 2.34 x 100

234

400

What is 1.5 x 43

64.5

500

What is 1.25 x 4

5

Rules/Vocabulary

100

True or False : You line up the decimals up when multiplying decimals?

False

200

What do we call a number that we multiply?

factor 

300

Where should the decimal be put in this answer? 34.5 x 3.6 ________ 1242

124.2

400

What do we call the answer to a multiplication problem?

product

500

What property is this?  a x b = b x a

Commutative? Associative? 

commutative

Vocabulary

100

Do we count the number of decimals in the factors in order to place the decimal in the product?

true

200

What are the terms for  a x b = c

Factors and product

300

Operation in which your answer's decimal is determined by how many digits are behind the decimal in the problem.

Multiplication

400

what are two ways to say the number 0.3

three tenths  or zero point 3

500

Multiplication is another way of doing what? 

Repeated addition? Repeated subtraction?

Repetitive addition

Word Problems

100

Mark when to the store to by stuff to make dinner. He got 2 bananas for $ .56 each, a loaf of bread for $2.34, and 6 packages of meat for $4.67 each. How much money did he spend on the meat?

$28.08

200

A teacher has 3 boxes of pencils. Each box costs $4.75. How much does he spend on pencils?

$14.25

300

Jillian ordered 3 slices of pizza. Each slice costs $3.79. How much money did Jillian spend?

$11.37

400

If I bought some pizza that costs $11.37, how much money would I get back in change if I paid with $20.00?

$8.63

500

A construction company ordered 45 planks of wood. Each plank costs $5.25. How much money does the construction company spend on the planks?

The company spent $236.25