10 has POWER
10, 100, and 1,000 written as exponents
101, 102, 103
1.44
8 / 12.4
1.55
How is multiplying a decimal by a whole number similar to and different from multiplying two whole numbers?
You use the same steps, but when multiplying a decimal by a whole number you need to place the decimal point in the product.
576.4 / 62
10
16.3 X 103
16,300
2.78 X 0.8
2.224
361.5 / 12
30.125
Ms. Whitney ran 4 laps in 209.2 seconds. If she ran at the same speed for each lap, what was her time for each lap?
52.3 seconds
$175.32 / 3
60
21.5 / 102
0.215
What property of multiplication is represented by the following:
2.1 X 4.3 = 4.3 X 2.1
Commutative Property of Multiplication
Write the steps for dividing a decimal by a decimal.
State if there can ever be a remainder when dividing decimals.
1.) Multiply the divisor by a power of 10 to make it a whole number, multiply the dividend by the same power of 10.
2.) Move the decimal above the dividend
3.) Divide as with whole numbers
4.) If needed annex a 0
5.) Check your work using multiplication
NO REMAINDERS
The average honeybee can travel 10.5 feet per second. How many feet can the honeybee travel in 3.7 seconds?
38.85 feet
33.3 X 33
900
6.3 / 1,000
0.0063
38.4 X 0.85
32.64
3.51 / 0.78
4.5
Which expression does not belong to the others? Explain your reasoning
6.7 / 10
4 / 1,000
0.2 / 1
52.1 / 100
4 / 1,000 because the dividend is not a decimal
63.44 X 6
360
Tell what number you must divide 180 by to get 1.8
100 or 102
Ms. Whitney is buying ingredients for a recipe. The cheese costs $3.79 per pound and the bread costs $4.59 per pound. How much will she spend on 4.5 pounds of bread and 3.5 pounds of cheese?
$33.92
84.78 / 0.15
565.2
Ms. Whitney purchased 6.75 pounds of flour. How much flour does she need to put in each bag if she divides the total amount into 10 equal-sized bags?
0.675 pounds
Apples cost $0.98 per pound. About how much would it cost to purchase 5.5 pounds of apples.
$6