Least Common Denominator
Find the Product
Number Line
Find "x"
Greater / Less / Equal
100

It's the LCD of 

2/3  &  3/5

15

100

12 * 5

60

100

8 + 14

22

100

5 + x = 7

x = 2

100

3/4 and 11/16

3/4 > 11/16

200

It's the LCD of 

3/8  &  1/6

24

200

113 * 0

0

200

12 + (-1)

11

200

x - 12 = 15

x = 27

200

3/4 and 6/8

3/4 = 6/8

300

It's the LCD of 

5/8  &  1/2

8

300

-3 * 3

-9

300

-13 - 5

- 18

300

4x = 20

x = 5

300

2/5 and 3/20

2/5 > 3/20

400

It's the LCD of 

25/14  &  1/6

42

400

12 * -4

-48

400

0 + (-3)

- 3

400

2 + x = -12

x = - 14

400

7/8 and 11/16

7/8 > 11/16

500

It's the LCD of 

4/15  &  7/9

45

500

-10 * -10

+ 100

500

5 + (-10) + 11

+ 6

500

x^2 = 36

x = 6

500

5/8 and 0.675

5/8 < 0.675