Answer :
first make bottom numbers the same
3/8 and 2/3
common multiple is 24
3/8 times 3/3=9/24
2/3 times 8/8=16/24
1/3 times 8/8=8/24
(9/24+16/24)+8/24
9+16+8=33
33/24= 1 and 9/24= 1 and 3/8=12/8
3/8 and 2/3
common multiple is 24
3/8 times 3/3=9/24
2/3 times 8/8=16/24
1/3 times 8/8=8/24
(9/24+16/24)+8/24
9+16+8=33
33/24= 1 and 9/24= 1 and 3/8=12/8