adding unlike fractions
1/2 +1/4
75/100
10/50 - 100/1000
5000/50000
99/100 - 30/50
39/100
15/50+10/25
35/50
7/200
3/5 + 5/8
1 9/40
10 50/100 - 20/60
1700/6000
15/30-30/60
0
50/100+25/50
1
1/7 - 50/90
49/630
12 4/10 +5/15
12 65/150
30/60 -15/30
15/60
25/50 - 25/100
25/100
1/2 +1/4
75/100
1/5 - 5/47
4/235
2/5 + 5/10
9/10
50/60-20/30
10/60
50/60-15/30
20/60
1/8 + 5/10
6/10