2/7+3/7;11/15-7/15. 1/2+1/4; 2/3-4/9

Question

2/7+3/7;11/15-7/15.



1/2+1/4; 2/3-4/9

Answer 1

2/7+3/7=5/7;
11/15-7/15=4/15.
1/2+1/4=2/4+1/4=3/4;
2/3-4/9=6/9-4/9=2/9

Answer 2

2/7 + 3/7 = 5/7
11/15 - 7/15 = 4/15
1/2 + 1/4 = 2/4 + 1/4 = 3/4
2/3 - 4/9 = 6/9 - 4/9 = 2/9