Let’s go through each question from the image step by step:

1. $\frac{3}{5} - \frac{2}{7}$

To subtract these fractions, we need a common denominator:

• Least common denominator (LCD) of 5 and 7 is 35.
• Rewrite each fraction with a denominator of 35: $\frac{3}{5} = \frac{21}{35}, \quad \frac{2}{7} = \frac{10}{35}$
• Now subtract: $\frac{21}{35} - \frac{10}{35} = \frac{11}{35}$ So, the correct answer should be $\frac{11}{35}$.

2. Simplify $\frac{18}{21}$

• Find the greatest common divisor (GCD) of 18 and 21, which is 3.
• Divide both numerator and denominator by 3: $\frac{18 \div 3}{21 \div 3} = \frac{6}{7}$ So, the simplified fraction is $\frac{6}{7}$.

3. $532 \div 133$

• Performing the division: $532 \div 133 = 4$

4. Convert $2.41$ liters to milliliters.

• Since 1 liter = 1000 milliliters: $2.41 \times 1000 = 2410 \, \text{mL}$ It looks like the box shows $1.2$ mL, but this is incorrect for the conversion. The correct value is 2410 mL.

Let me know if you'd like further clarification or help! Here are five questions related to this content for additional practice:

1. What is $\frac{7}{10} + \frac{3}{20}$?
2. Simplify $\frac{24}{36}$.
3. What is $672 \div 14$?
4. How many milliliters are in 3.5 liters?
5. What is the decimal form of $\frac{9}{16}$?

Tip: When working with fractions, always check if you can simplify them by finding the greatest common divisor (GCD).