Powers of 10
Place Value
Multiplying Decimals
Multiplying Decimals too!
Estimation
100

The means 10 squared.

What is 10 to the second power?

100

The 7 is in this place in the number 472.39

What is tens place?

100

3.1 x 2.2

What is 6.82?

100
You should move the decimal in this direction when you are multiplying by powers of 10.
What is the right?
100

The best estimate for 22.1 x 51.9?

What is 20 x 52 or 1040?

200

10 zero power.

What is 1?

200
The 5 is in this place in 7,425.36
What is ones place?
200

1.42 x 100

What is 142?

200
This determines the number of decimal places that will be in the product.
What is the number of decimal places in the factors?
200

The best estimate for 5.07 x 0.81.

What is 5 x 1 or 5?

300

10 to the first power.

What is 10?

300
The 4 is in this place in the number 157.428
What is tenths place?
300

3.36 x 9.3

What is 31.248?

300
This is how we can check any division problem.
What is by multiplying?
300

The best estimate for 47.9 x 384.3.

What is 50 x 400 or 20,000?

400

10 to the third power.

What is 1000 or 10 cubed?

400
The 3 is in what place value in the number 125.039
What is hundredths place?
400

7.45 x 1000

What is 7,450?

400
23.87 divided by 100?
What is 0.2387?
400

The best estimate for 1.85 x 26. 

What is 2 x 26 or 52?

500

10 to the 4th power.

What is 10,000?

500
The 2 is in what place value in the number 159.362
What is the thousandths place?
500

0.092 x 0.03

What is 0.00276?

500
This is the full method for multiplying decimals.
What is (student supplied steps)?
500

The best estimate for 24.7 x 19.8. 

What is 25 x 20 or 500?

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