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MultiplyingDecimals
Unit 3.5 Pages 126-128
1. 87 x 320 =
2. 943 x 800 =
3. 3,806 x 10 =
27,840
754,400
38,060
Warm Up Problems Multiply
3.5 Multiplying Decimals.
Objective: by the end of class students can multiply whole numbers and numbers with decimals.
We follow the same rules for multiplying whole numbers, as we multiply numbers
with decimals in them.
258 x 37
2.58x 3.7
9546 9 5 46
The total number of
decimal places in the equation
will need to equal the total
number or decimal places in the solution.
2.58x 3.7 9.546
2 places
1 place
3 places total
Showing the same equation in fractions can help us understand how we come up with a solution.
3.7 x 2.58 37 x 25810 100
= 9546 1,000= 9.546
First multiply the equation like you normally would.
Count the total number of decimal places in the problem.The product (or answer) needs to have the same number of decimal places too.
Find each Product 3 x .17
0.17x 30 51
First multiply the equation like you normally would.
Count the total number of decimal places in the problem.The product (or answer) needs to have the same number of decimal places too.
Find each Product 0.2 x 0.6
0.2x 0.60 12
First multiply the equation like you normally would.
Count the total number of decimal places in the problem.The product (or answer) needs to have the same number of decimal places too.
Find each Product 3.25 x 4.8
3.25x 4.8
15 600
First multiply the equation like you normally would.Count the total
number of decimal places in the
problem.The product (or
answer) needs to have the same
number of decimal places too.
0.6 x 0.4
0.6x 0.4
0.24
#3 find each product
First multiply the equation like you normally would.Count the total
number of decimal places in the
problem.The product (or
answer) needs to have the same
number of decimal places too.
0.008 x 0.5
0.008x 0.5
0.0040
#4 find each product
First multiply the equation like you normally would.Count the total
number of decimal places in the
problem.The product (or
answer) needs to have the same
number of decimal places too.
3.0 x 0.07
3.0x 0.07
0.21
#5 find each product
First multiply the equation like you normally would.Count the total
number of decimal places in the
problem.The product (or
answer) needs to have the same
number of decimal places too.
0.12 x 0.6
0.12x .06
0.0072
#6 find each product
multiply the equation like you normally
would.
Count the total number of decimal places in the
problem.
The product (or answer) needs to have
the same number of decimal places too.
Evaluating decimal Expressions
x= 4.047
3 x4.047
Replace the variable with the given number.
4.047x 312 141
multiply the equation like you normally
would.
Count the total number of decimal places in the
problem.
The product (or answer) needs to have
the same number of decimal places too.
Evaluating decimal Expressions
x= 2.95
3 x2.95
Replace the variable with the given number.
2.95x 3 8 85
First multiply the equation like you normally would.Count the total
number of decimal places in the
problem.
The product (or answer) needs to
have the same number of decimal
places too.
x= 3.304
3.304x 5
16.52
#7 Evaluate 5x Replace the variable with the given
number.
x
First multiply the equation like you normally would.Count the total
number of decimal places in the
problem.
The product (or answer) needs to
have the same number of decimal
places too.
x= 7.126
7.126x 5
35.63
#8 Evaluate 5x Replace the variable with the given
number.
x
First multiply the equation like you normally would.Count the total
number of decimal places in the
problem.
The product (or answer) needs to
have the same number of decimal
places too.
x= 4.58
4.58x 5
22.90
#8 Evaluate 5x Replace the variable with the given
number.
x
First multiply the equation like you normally would.Count the total
number of decimal places in the
problem.
The product (or answer) needs to
have the same number of decimal
places too.
x= 1.9
1.9x 5
9.5
#10 Evaluate 5x Replace the variable with the given
number.
x
3.5 Homeworkpage 124-125
Due:
8-29Mrs. Saucedo’s Class
14-29
0.8 x 0.07 0.006 x 0.07
0.056
6.43221.64
0.00042
Find each product
8x x = 2.705
8x x = 0.804