Kathy has 1 loaf of bread. she cuts 2/3 of it fir her friend and 1/12 for herself. what fraction of the bread is left?

3/12 or 1/4 is left of the bread

2*4
= 8/12 - i did this for a common denominator
3*4

 8       1       9
---  +  ---  = --- i did this to find the total eaten
12      12    12

12      9     3                            1
---  _ --- = --- or simplified as
12     12   12                           4

the total amount of bread left is 3/12 or 1/4 (simplified)