Decimals

Place Value

200

In 9.81, what place is the 1 in?

Hundredths 

400

In 28.465, what place is the 5 in?

Thousandths 

600

129.87946 What is the value of the 6?

Hundred Thousandths 

800

In 1.203 what place is 2 in?

Tenths 

1000

In 93.4258, what place is the 8 in

Ten Thousandths 

Multiplying by 10, 100. 1000

200

12.1 x 100

1,210

400

9,563 x 10 =

95,630

600

52.1 x 1,000 =

52,100

800

0.321 x 100 =

32.1

1000

59.8 x 1,000 =

59,800

Adding Decimals

200

Add these decimals. 21.74 + 8.27

30.01

400

Add these decimals. 6.125 + 18

24.125

600

Add these decimals. 5.2 + 3.11

8.31

800

Add these decimals. 17 + 9.54

26.54

1000

Add these decimals. 4.67 + 29.1

33.77

Multiplying Decimals

200

Multiply these decimals. 0.03 * 10

.3

400

Multiply these decimals. 0.23 * 7

1.61

600

Multiply these decimals. 4.4 * 5.3

23.32

800

Multiply these decimals. 0.7 * 2.6 

1.82

1000

Multiply these decimals. 2.5 * 7

17.5

Subtracting Decimals.

200

Subtract these decimals.

3.53 - 2

1.53

400

Subtract these decimals.

10.71 - 0.7

10.01

600

Subtract these decimals.

2.54 - 1.82

0.72

800

Subtract these decimals.

2.15 - 1.05

1.1

1000

Subtract these decimals.

1.72 - 0.8

0.92

Scientific Notation

200

1,576,000

1.576 x 10⁶

400

9,305

9.305 x 10³

600

8,000,000,000

8 x 10⁹

800

.00031058

3.1058 x 10^-4

1000

1.5673 x 10⁷

15,673,000

Math Trivia

200

How many digits does the value of Pi have?

Infinite

400

What is the term used for the perimeter of a circle?

Circumference

600

Which country invented the use of negative numbers?

China

800

What number does the term “Giga” refer to?

One Billion

1000

What is the name of the number system that has a base of two? Ex: 1011000101

Binary