5 3/4 acres
==================
Add the acres plowed in the morning and the acres plowed in the afternoon.
First, we add the whole number parts of the mixed numbers:
- 4 acres + 1 acre = 5 acres
Then, we add the fractional parts:
- 1/8 acre + 5/8 acre = 6/8 acre
Now, we can simplify the fraction:
Finally, we add the whole number and the simplified fraction:
- 5 acres + 3/4 acre = 5 3/4 acres