When we multiply two or more decimals, we first pretend they are all whole numbers. We perform the multiplication and report our answer. We then move our decimal point to the left one spot for each decimal place between all of the factors.

Test Objectives
• Demonstrate the ability to set up a vertical multiplication
• Demonstrate the ability to multiply decimals
• Demonstrate the ability to multiply a decimal by a power of ten
Multiplying Decimals Practice Test:

#1:

Instructions: Find each product.

a) 0.305 • 2.6

b) -1.25 • 102

#2:

Instructions: Find each product.

a) -0.485 • -0.13 • -3.9

#3:

Instructions: Find each product.

a) -51 • 0.0005

b) (3.2)(-6.1)(100)

#4:

Instructions: Find each product.

a) 0.198652015 • 107

b) 83.22 • 10,000

#5:

Instructions: Find each product.

a) -2.27 • -4.5 • -10,000 • -1.64

Written Solutions:

#1:

Solutions:

a) 0.793

b) -125

#2:

Solutions:

a) -0.245895

#3:

Solutions:

a) -0.0255

b) -1952

#4:

Solutions:

a) 1,986,520.15

b) 832,200

#5:

Solutions:

a) 167,526