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Mathematics
4th -
5thgrade
Multiplying and Dividing Decimals by Powers of Ten
20 questions
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- 1. Multiple Choice
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
- 2. Multiple Choice
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
- 3. Multiple Choice
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
- 4. Multiple Choice
Solve. 3.40 x 100
3.40
34.0
340
3,400
- 5. Multiple Choice
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.
- 6. Multiple Choice
Which way do you move the decimal when you multiply by powers of ten?
to the left
to the right
- 7. Multiple Choice
Which way do you move the decimal when you divide by powers of ten?
to the right
to the left
- 8. Multiple Choice
Solve: 0.08 x 10,000
.08
80
800
8,000
- 9. Multiple Choice
Solve: 50 x 3,000
15,000.0
150.00
1,500,000
150,000
- 10. Multiple Choice
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- 11. Multiple Choice
Solve. 8.6 x 100
8.6
860
8,600
.086
- 12. Multiple Choice
Solve. 5.42 divided by 10
54.2
.542
.0542
542
- 13. Multiple Choice
Divide 85 into 100 groups
8.5
85
850
.85
.085
- 14. Multiple Choice
3 divided by 10
3
.3
.03
30
- 15. Multiple Choice
5 divided by 100
.5
.05
.005
500
- 16. Multiple Choice
Multiply .3 x 8
24
2.4
.24
240
- 17. Multiple Choice
. _ x ._ Look at this problem, where would you put the decimal in the answer? How would the answer look?
. _
_ _ .
. _ _
. _ _ _
- 18. Multiple Choice
76.3 divided by 1,000
7.63
.763
.0763
.oo763
- 19. Multiple Choice
Divide 745 into 10 groups. Hint: What do you do if you don't see the decimal?
7,450
745
74.5
7.45
- 20. Multiple Choice
.654 x 1,000=
.645
645
.000645
6.45
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