WorksheetsNumbers and Base Ten, Multiplication, Division
Total questions: 20
Worksheet time: 39mins
When you multiply decimals by powers of ten,
take a good guess
smile, chances are you'll get one right
use the Zero Rule and pretend the decimal isn't there
there's a short cut to use if you understand, we have a base ten math system
Find the example of a question where you would use the Zero Rule
42 x 19
40 x 1.5
400 x 20
4.56 x 1,000
When you multiply decimals by powers of ten,
add as many zeroes as you see
count the number of zeroes
move the decimal, however many zeroes are in the power of ten number
move the decimal wherever you want
Solve. 3.40 x 100
3.40
34.0
340
3,400
How do you know which direction to move the decimal?
Guess! You have a 50% chance of getting it right
It doesn't matter. Math has many right answers.
Sing the song!
Ask your teacher.
Which way do you move the decimal when you multiply by powers of ten?
to the left
to the right
Which way do you move the decimal when you divide by powers of ten?
to the right
to the left
Solve: 0.08 x 10,000
.08
80
800
8,000
Solve: 50 x 3,000
15,000.0
150.00
1,500,000
150,000
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Solve. 8.6 x 100
8.6
860
8,600
.086
Solve. 5.42 divided by 10
54.2
.542
.0542
542
Divide 85 into 100 groups
8.5
85
850
.85
.085
3 divided by 10
3
.3
.03
30
5 divided by 100
.5
.05
.005
500
Multiply .3 x 8
24
2.4
.24
240
. _ x ._ Look at this problem, where would you put the decimal in the answer? How would the answer look?
. _
_ _ .
. _ _
. _ _ _
76.3 divided by 1,000
7.63
.763
.0763
.oo763
Divide 745 into 10 groups. Hint: What do you do if you don't see the decimal?
7,450
745
74.5
7.45
.654 x 1,000=
.645
645
.000645
6.45
