Natalie likes to mail lots of postcards when she goes on vacation. In 2014, the cost of a postcard stamp was $0.34.

Part A:Natalie buys 10 postcard stamps. What is the total cost of the stamps?

Part B:Natalie and her friends decide to buy 100 postcard stamps. What will be the total cost of the stamps?

Part A: The total cost of 10 stamps = $3.4

Part B: The total cost of 100 stamps = $34

Step-by-step explanation:

The cost of each postcard stamp = $0.34

Part A:

Number of postcard Natalie buys = 10

So, the cost of 10 postcard stamps = 10 x Cost of each stamp

= 10 x ($0.34) = $3.4

or, the total cost of 10 stamps = $3.4

Part B:

Number of postcard Natalie buys = 100

So, the cost of 100 postcard stamps = 100 x Cost of each stamp

= 100 x ($0.34) = $34

or, the total cost of 100 stamps = $34