Unit Review!

Multiplying Decimals

100

0.5 x 0.3

0.15

200

1.4 x 0.2

0.28

300

2.6 x 4

10.4

400

What is one instance where when we multiply, numbers get smaller?

When we multiply decimals by decimals with no whole numbers!

500

3.4 x 6.1

20.74

Powers of 10

100

This power of 10 equals what number? 

10²

1000

200

Put this number into a power of 10:

10,000

10⁴

300

What is one key indicator that tells you how to convert a number into a power of 10?

The zeros!

400

This power of 10 equals what number?

10⁶

1,000,000 - One million

500

Put this number into a power of 10:

1,000,000,000

10⁹

Decimal Addition

100

10+0.5

10.5

200

12.3+3.1

15.4

300

78.44+8.92

87.36

400

136.45+97.88

234.33

500

What is one thing you have learned about adding with decimals that is different than adding with whole numbers? 

  - You need to line up the decimals

  - The place values need to be lined up                      - You can't line up all your numbers to the right side

Decimal Subtraction

100

0.8 - 0.46

0.34

200

What happens when we do not have the same number of place values in the decimal subtraction problem?

You add zeros!

300

1 - 0.32

0.68

400

1.46 - 0.78

0.68

500

0.865 - 0.494

0.371

Decimal Place Value

100

Name the underlined place value:

1.249

Tenths

200

Name the underlined place value:

4.389

Hundredths

300

Name the underlined place value:

5.438

Thousandths

400

Which underlined place value has a GREATER value?

13.452 or 7.328

The underlined 3 has a greater value.

500

Order the place values from least value to greatest value:

Tenths, Hundredths, Thousandths

Thousandths, Hundredths, Tenths