Rational Numbers

LCD

100

What is the the least common denominator between 3 and 6? 

6 

200

What is the least common denominator between 4 and 6? 

12

300

What is the least common denominator between 7 and 5? 

35

400

What is the least common denominator between 6 and 9? 

18 

500

What is the least common denominator between 8 and 10? 

40

Convert

100

What is 9/10 as a decimal? 

0.9

200

What is 0.75 as a fraction in simplest form? 

3/4

300

What is - 3/20 as a decimal? 

- 13/40

400

What is -1.28 as a fraction in simplest form?

-1 7/25

500

What is 5/8 as a decimal? 

0.625

Add

100

-1/2 + 2/4=

0

200

-5.8 + 2.6 = 

-3.2

300

-4.28 + (-2.56)=

-6.84

400

4/5 + 3/8 = 

1 7/40 or 47/40

500

-13/6 + 7/12 =

-1 7/12

Subtract

100

5/12 - 2/6 =

1/12 

200

3 3/4 - 7/8 = 

2 7/8

300

3.8 - (-7.45) =

11.25

400

-4 2/5 - (-3/5) =

-3 4/5

500

9.1 - 12.9 = 

-3.8

Multiply and Divide

100

9/10 divided by 6/5 

3/4

200

8/15(-2/3)=

-16/35

300

4.5(-5.26) =

-23.67

400

-4/11 divided by 2/7

-1 3/11 or --14/11

500

-15.4 divided by (-2.5) 

6.16