Unit 5 Review: Multiplying/Dividing decimals

Unit 5 Review:

Multiplying/Dividing decimals

Whole number X decimal

• Multiply.

• Add the number of decimal places to decide where to put the decimal point.

Multiple Choice

     1.45

 $\times$   38

• 5,510

• 5.510

• 55.1

whole number x decimal (money)

• Multiply.

• Add the number of decimal places to decide where to put the decimal point.

Multiple Choice

Sam bought three lemons for a cost of $0.30 each.  The model shows the situation.  Which equation shows how to find the total cost in dollars and cents of the lemons Sam bought?

• 3 X 3 = 9.00

• 3 X 0.03 = 0.09

• 3 X 30 = 90.00

• 3 X 0.30 = 0.90

Decimal divided by one digit divisor

• Take the divisor and multiply it by 1-9

• Put the decimal point right above the other one.

• Then start dividing.

Multiple Choice

$2.35 $\div$  5 $=$  

• $4.07

• $0.47

• $47.00

• $4.70

Decimal divided by one digit divisor using models

• The dividend is the total number of blocks

• The divisor is how many groups

• The total number in each group is the quotient

Multiple Choice

Which equation does this model represent?

• 1.8 $\div$  6 = 0.3

• 1.8 $\div$  3 = 0.6 

• 0.18 $\div$  6= 0.03

• 0.18  $\div$  3 = 0.06

Order of operations with decimals

• P ( )

• B [ ]

• M  $\times$  

• D  $\div$  

• A   +

• S     -

Multiple Choice

What is the value of the expression?

7 x (5.3 + 13.7) - 4

• 18.69

• 129

• 105

• 186.9

Order of operations with decimals

• P ( )

• B [ ]

• M  $\times$  

• D  $\div$  

• A  +

• S  -

Multiple Choice

What value is equivalent to the expression?

3 [ 9.5 - 4(2.2)]

• 11.11

• 19.7

• 30.06

• 2.1