Mr. Ross washed 
2
5
 of his laundry. His son washed 
1
3
 of it. Who washed most of the laundry? How much of the laundry still needs to be washed?
Solve this on paper. Then check your work on Zearn.
Who washed most of the laundry?

2
5
 is greater than 
1
3

so 
Mr. Ross
 washed most of the laundry.
Good work!
Solve this on paper. Then check your work on Zearn.
How much of the laundry still needs to be washed?
 of the laundry still needs to be washed.

To solve this problem, let’s analyze the fractions:

1. **Determine who washed most of the laundry:**
   - Mr. Ross washed \( \frac{2}{5} \) of the laundry.
   - His son washed \( \frac{1}{3} \) of the laundry.

To compare \( \frac{2}{5} \) and \( \frac{1}{3} \), let's find a common denominator:
   - The least common multiple of 5 and 3 is 15.
   - Converting each fraction:
     - \( \frac{2}{5} = \frac{2 \times 3}{5 \times 3} = \frac{6}{15} \)
     - \( \frac{1}{3} = \frac{1 \times 5}{3 \times 5} = \frac{5}{15} \)

Since \( \frac{6}{15} > \frac{5}{15} \), **Mr. Ross washed more of the laundry**.

2. **Calculate how much laundry still needs to be washed:**
   - Add the fractions of laundry washed:
     - \( \frac{2}{5} + \frac{1}{3} \).
   - With a common denominator of 15:
     - \( \frac{6}{15} + \frac{5}{15} = \frac{11}{15} \).

So, \( \frac{11}{15} \) of the laundry has been washed. 

To find the remaining amount:
   - \( 1 - \frac{11}{15} = \frac{15 - 11}{15} = \frac{4}{15} \).

Thus, **\(\frac{4}{15}\) of the laundry still needs to be washed.**

---

Would you like additional details on any part? 

Here are some related questions for practice:
1. If Mr. Ross washed \( \frac{3}{5} \) instead, how much would still need to be washed?
2. Suppose his son had washed \( \frac{2}{3} \). Who would have washed more then?
3. How much laundry remains if Mr. Ross washed \( \frac{4}{5} \)?
4. If they washed \( \frac{3}{5} \) and \( \frac{2}{5} \), respectively, what fraction is left?
5. How would the answer change if the laundry load doubled?

**Tip:** To compare fractions quickly, convert them to a common denominator or decimal form.

Mr. Ross washed 2/5 of his laundry. His son washed 1/3 of it. Who washed most of the laundry? How much of the laundry still needs to be washed?

Solve the laundry problem by comparing fractions to determine who washed most of the laundry. Then, calculate the fraction of laundry still left to wash. Learn key skills in fraction comparison, addition, and subtraction. Suitable for Grades 4-5.

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