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Multiplication with Decimals
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Josey is making lanyards for a convention. She needs to make 1,000 lanyards and knows that 1 lanyard uses 1.75 feet of cord. How much cord will Josey need?
1,750 yards
The cost to park a car in a parking lot is $3.45 per hour. Maliki parked his car for 4 hours on Monday and 3 hours on Tuesday. How much did he spend on parking?
$10.35
Sue buys material to make a costume. She buys 1.75 yards of red material. She buys 1.2 times as many yards of blue material. How many yards of blue material does Sue buy?
2.1 yards
If you are multiplying a number by a power of ten that includes an exponent, how do you know how many places to move the decimal?
Look at the exponent. It moves that many places.
If you are multiplying a number by a power of ten that includes an exponent, what direction will the decimal move?
Right
0.9 x 5
4.5
0.62 x 0.9
0.558
0.4 x 0.02
0.008
How many places and to what direction will the decimal move in the following problem? 16.82x100
Two place to the right.
How many places and to what direction will the decimal move in the following problem? 16.82x0.001
Three places to the left.
10 x 4.15
41.5
100 x 32.16
3,216
24.5 x 0.3
7.35
 11.2 x 4.5
50.4
2.1 x 6.1
12.81
10.65 x 9.6
102.24
5.8 x 2.2
12.76
5.6 x 10.7
59.92
1.3 x 7.2
9.36
6.3 x 6.3
51.59
3.3 x 4.15
13.695
7.7 x 6.7
51.59
7.3 x 5.6
40.88
 3 x 3.1
9.3
4.4 x 3.08
13. 552
4 x 6.81
27.24
 1.6 x 4.3
6.88
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