Martha worked on her science project for 4/5 of an hour on both Friday and Saturday. To find the total number of hours she worked, we add the work done on each day:

$\frac{4}{5} + \frac{4}{5} = \frac{4 + 4}{5} = \frac{8}{5}$

The total time worked is 8/5 hours, which can also be written as:

$\frac{8}{5} = 1 \text{ hour and } \frac{3}{5} \text{ of an hour}$

So, Martha worked a total of 1 hour and 36 minutes over the two days.

Would you like more details on how I performed the calculation? Or do you have any other questions?

Related Questions:

1. How can we convert improper fractions to mixed numbers?
2. What does "five-fifths" equal as a fraction, and how is it used in real life?
3. How can you apply fractions when measuring time or work hours?
4. How do you add fractions with the same denominator?
5. Can you subtract fractions with the same denominator? How?

Tip:

When adding fractions with the same denominator, simply add the numerators and keep the denominator the same!