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Let's solve this problem step by step.

Cho used:
- \( 2 \frac{2}{3} \) cups of flour for the cake.
- \( 3 \frac{1}{4} \) cups of flour for the loaf of bread.

We need to calculate how much more flour Cho used for the bread than for the cake.

### Step 1: Convert the mixed numbers into improper fractions.
For the cake:
\[
2 \frac{2}{3} = \frac{8}{3}
\]

For the loaf of bread:
\[
3 \frac{1}{4} = \frac{13}{4}
\]

### Step 2: Find the difference.
We need to subtract the amount used for the cake from the amount used for the bread:
\[
\frac{13}{4} - \frac{8}{3}
\]

To subtract these fractions, we need a common denominator. The least common denominator (LCD) of 4 and 3 is 12.

Convert the fractions:
\[
\frac{13}{4} = \frac{39}{12}
\]
\[
\frac{8}{3} = \frac{32}{12}
\]

Now subtract:
\[
\frac{39}{12} - \frac{32}{12} = \frac{7}{12}
\]

So, Cho used \( \frac{7}{12} \) cups more flour for the bread than for the cake.

### Final Answer:
The correct answer is \( \frac{7}{12} \) cup, which matches the third option.

---

Would you like more details or have any questions? 

Here are 5 related questions for practice:
1. How do you find the least common denominator of two fractions?
2. What is the process to convert a mixed number into an improper fraction?
3. How can you simplify a fraction after subtracting or adding?
4. What is the benefit of using improper fractions over mixed numbers when performing operations?
5. Can you explain the steps to convert an improper fraction back into a mixed number?

**Tip**: When subtracting or adding fractions, always check if the denominators are the same. If they are not, find the least common denominator first!

Cho used 2 2/3 cups of flour to bake a cake. She used 3 1/4 cups of flour to bake a loaf of bread. How much more flour did Cho use to bake the loaf of bread than to bake the cake?

Learn how to solve a fraction subtraction problem with mixed numbers using improper fraction conversion and the least common denominator (LCD). This example involves 2 2/3 cups of flour for a cake and 3 1/4 cups for a loaf of bread. Find out how much more flour was used for the bread. Ideal for students in Grades 5-7.

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