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Simply
Adding mixed numbers
Subtracting mixed numbers
improper fraction
LCM
100

10/12

5/6

100

2 1/2 + 2 1/4

4 3/4

100

8 1/2 - 6 1/4

2 1/4

100

20/12

1 2/3

100

3 and 6

3- 3,6,12,15,18

6- 6,12,18

LCM-18

200

20/25

4/5

200

3 2/7 + 5 6/7

8 8/9


9 1/7

200

7 9/10 - 3 2/5

4 5/10 


4 1/2

200

35/21

1 2/3

200

4 and 9

4-4,8,12,16,20,24,28,32,36

9-9,18,27,36


LCM-36

300

9/33

3/11

300

7 3/4 + 2 2/3

9 17/12


10 5/12

300

3 7/9 - 2 1/6

1 11/18

300

29/8

3 5/8

300

10 and 12

10- 10,20,30,40,50,60

12-12,24,36,48,60


LCM-60

400

100/360

5/18

400

13 7/8 + 10 1/6

23 25/24 


24 1/24

400

9 1/2 - 5 1/4

17/4


4 1/4

400

104/48

2 1/6

400

8 and 11

8-8,16,24,32,40,48,56,64,72,80,88

11-11,22,33,44,55,66,77,88

LCM-80

500

99/225

11/25

500

7 1/3 + 2 1/3+ 3 2/9

12 8/9

500

4 3/4 - 3 7/12

1 2/12


1 1/6

500

115/40

2 7/8

500

13 an 7 

13- 13,26,39,52,65,78,91

7-7,14,21,28,35,42,49,56,63,70,77,84,91

LCM-91