 Multiplying and Dividing Decimals by Powers of Ten
9 months ago
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• Question 1
120 seconds
Q.

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

• Question 2
120 seconds
Q.

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

• Question 3
120 seconds
Q.

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

• Question 4
120 seconds
Q.

Solve. 3.40 x 100

3.40

34.0

340

3,400

• Question 5
120 seconds
Q.

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!

• Question 6
120 seconds
Q.

Which way do you move the decimal when you multiply by powers of ten?

to the left

to the right

• Question 7
120 seconds
Q.

Which way do you move the decimal when you divide by powers of ten?

to the right

to the left

• Question 8
120 seconds
Q.

Solve: 0.08 x 10,000

.08

80

800

8,000

• Question 9
120 seconds
Q.

Solve: 50 x 3,000

15,000.0

150.00

1,500,000

150,000

• Question 10
120 seconds
Q.

Do you like Kahoot or Quizizz better?

Kahoot

the new Quizizz

• Question 11
120 seconds
Q.

Solve. 8.6 x 100

8.6

860

8,600

.086

• Question 12
120 seconds
Q.

Solve. 5.42 divided by 10

54.2

.542

.0542

542

• Question 13
120 seconds
Q.

Divide 85 into 100 groups

8.5

85

850

.85

.085

• Question 14
120 seconds
Q.

3 divided by 10

3

.3

.03

30

• Question 15
120 seconds
Q.

5 divided by 100

.5

.05

.005

500

• Question 16
120 seconds
Q.

Multiply .3 x 8

24

2.4

.24

240

• Question 17
60 seconds
Q.

. _ x ._ Look at this problem, where would you put the decimal in the answer? How would the answer look?

. _

_ _ .

. _ _

. _ _ _

• Question 18
120 seconds
Q.

76.3 divided by 1,000

7.63

.763

.0763

.oo763

• Question 19
120 seconds
Q.

Divide 745 into 10 groups. Hint: What do you do if you don't see the decimal?

7,450

745

74.5

7.45

• Question 20
120 seconds
Q.

.654 x 1,000=