Module 1
Multiplying Decimals Part 2
Objectives: - Multiplication with Decimals
Lesson 1
Start
Where does the decimal go?
Multiply the whole numbers first. Then, count how many spots are occupied behind the decimal in each of the factors. This TOTAL is how many decimal spots you should have in your final answer.
0.0015
0.015
0.15
1.5
3 • 5 = 15
3•0.5
0.03•0.5
0.3•0.005
3•0.05
0.3•5
3•0.005
0.03•0.05
0.3•0.5
Where does the decimal go?
Multiply the whole numbers first. Then, count how many spots are occupied behind the decimal in each of the factors. This TOTAL is how many decimal spots you should have in your final answer.
4 • 8 =
32
0.0032
0.032
0.32
3.2
4•0.08
0.4•8
4•0.008
0.04•0.08
4•0.8
0.8•0.004
0.04•0.8
0.4•0.8
Where does the decimal go?
Multiply the whole numbers first. Then, count how many spots are occupied behind the decimal in each of the factors. This TOTAL is how many decimal spots you should have in your final answer.
.0030 = .003
0.030 = 0.03
0.30=0.3
3.0 = 3
5 • 6 =
30
0.5•6
0.5•0.06
5•0.06
0.05•0.6
0.5•0.006
5•0.6
0.05•0.06
0.5•0.6
Where does the decimal go?
5•9 =
45
20
5 • 4 =
3 • 5 = 15
0.5•9
5•0.09
5•0.04
0.5•0.04
0.5•0.009
0.5•0.9
0.5•4
0.5•0.4
0.05•0.9
5•0.9
0.05•0.04
0.05•0.4
0.05•0.09
5•0.009
0.5•0.004
5•0.4
.0020 = .002
0.020 = 0.02
0.20=0.2
2.0 = 2
0.45
0.045
0.45
4.5
0.0015
0.015
0.15
1.5
3•0.05
3•0.005
0.03•0.5
0.3•0.5
0.3•5
0.03•0.05
0.3•0.005
3•0.5
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Transcript
Module 1
Multiplying Decimals Part 2
Objectives:- Multiplication with Decimals
Lesson 1
Start
Where does the decimal go?
Multiply the whole numbers first. Then, count how many spots are occupied behind the decimal in each of the factors. This TOTAL is how many decimal spots you should have in your final answer.
0.0015
0.015
0.15
1.5
3 • 5 = 15
3•0.5
0.03•0.5
0.3•0.005
3•0.05
0.3•5
3•0.005
0.03•0.05
0.3•0.5
Where does the decimal go?
Multiply the whole numbers first. Then, count how many spots are occupied behind the decimal in each of the factors. This TOTAL is how many decimal spots you should have in your final answer.
4 • 8 =
32
0.0032
0.032
0.32
3.2
4•0.08
0.4•8
4•0.008
0.04•0.08
4•0.8
0.8•0.004
0.04•0.8
0.4•0.8
Where does the decimal go?
Multiply the whole numbers first. Then, count how many spots are occupied behind the decimal in each of the factors. This TOTAL is how many decimal spots you should have in your final answer.
.0030 = .003
0.030 = 0.03
0.30=0.3
3.0 = 3
5 • 6 =
30
0.5•6
0.5•0.06
5•0.06
0.05•0.6
0.5•0.006
5•0.6
0.05•0.06
0.5•0.6
Where does the decimal go?
5•9 =
45
20
5 • 4 =
3 • 5 = 15
0.5•9
5•0.09
5•0.04
0.5•0.04
0.5•0.009
0.5•0.9
0.5•4
0.5•0.4
0.05•0.9
5•0.9
0.05•0.04
0.05•0.4
0.05•0.09
5•0.009
0.5•0.004
5•0.4
.0020 = .002
0.020 = 0.02
0.20=0.2
2.0 = 2
0.45
0.045
0.45
4.5
0.0015
0.015
0.15
1.5
3•0.05
3•0.005
0.03•0.5
0.3•0.5
0.3•5
0.03•0.05
0.3•0.005
3•0.5