Answer:
You ate 7/8 of the chocolate bar.
Step-by-step explanation:
First, we need to change 1/4 and 5/8 so that they have the same denominators (bottom numbers).
There's a common multiple of 8.
What you do to the bottom needs to be done to the top.
1 x 8 = 8
1 x 5 = 5
5/8
Your amount of chocolate stays the same.
4 x 2 = 8
1 x 2 = 2
2/8 is how much the sister had,
Finally, add the two fractions together.
2/8 + 5/8 = 7/8
You ate 7/8 of the chocolate bar.
Hope this helps, have a good day! :D