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Multiplying by Multiplying by powers of 10powers of 10
What are powers of 10?What are powers of 10?100,000
10,000
1,000
100
10
1
.1
.01
.001
.0001
.00001
GREATER THAN ONE
LESS THAN ONE
Look for a pattern.Look for a pattern.
1.24 x 1 = 1.24
1.24 x 10 = 12.4
1.24 x 100 = 124
1.24 x 1,000 = 1,240
1.24 x 10,000 = 12,400
The decimal point moves to the ______________ the same number of places as the number of zeros
in the power of 10 greater than one.
RIGHTRIGHT
ExamplesExamples
0.35 x 100 =
8.5 x 1000 =
2.72 x 1000 =
5.98 x 10,000 =
35
8,500
2,720
59,800
00
0
00
WRITE THIS DOWN!WRITE THIS DOWN!
If the power of 10 is…………..If the power of 10 is…………..
MORE THAN ONEMORE THAN ONE
Decimal moves RIGHT
You are almost
done!
You are the BEST!You are the BEST!
Let’s test your knowledge!Let’s test your knowledge!
0.25 x 100 =
6.55 x 100 =
0.9 x 10 =
3.48 x 10 =
25
655
9
9.
10.
11.
HOMEWORK
Page 143
#9-20, 52-53
34.812.
Look for a pattern.Look for a pattern.
12.4 x .1 = 1.24
12.4 x .01 = .124
12.4 x .001 = .0124
12.4 x .0001 = .00124
12.4 x .00001 = .000124
The decimal point moves to the ______________ the same number of digits as there are after the
decimal in the power of 10 less than one.
LEFTLEFT
ExamplesExamples
5.4 x 0.01 =
93.6 x 0.1 =
7.84 x 0.001 =
0.3 x 0.0001 =
0.054
9.36
0.00784
0.00003000
00
0
.
.
.
.
