2 1/4+3 3/4=6?

4 5/6-3 1/6=1 2/3

8 5/12- 1 1/2= 7 1/3

3 answers

They are right -- assuming there's a typo in the third problem.
9 3/4-7 1/2= 2 1/4

2 1/8+5 7/8=8

1 2/3+4 8/9=6 5/9
All are correct. :-)