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Let's solve the exercise you uploaded step by step:

### Exercise 3 asks to calculate:

#### a) 25% of 520
To calculate 25% of 520:
\[
\frac{25}{100} \times 520 = 0.25 \times 520 = 130
\]
So, **25% of 520 is 130**.

#### b) 5% of 90 mg
To calculate 5% of 90 mg:
\[
\frac{5}{100} \times 90 = 0.05 \times 90 = 4.5 \text{ mg}
\]
So, **5% of 90 mg is 4.5 mg**.

#### c) 75% of 3000 m²
To calculate 75% of 3000 m²:
\[
\frac{75}{100} \times 3000 = 0.75 \times 3000 = 2250 \text{ m²}
\]
So, **75% of 3000 m² is 2250 m²**.

#### d) 150% of 400 cL
To calculate 150% of 400 cL:
\[
\frac{150}{100} \times 400 = 1.5 \times 400 = 600 \text{ cL}
\]
So, **150% of 400 cL is 600 cL**.

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Do you want more details on any of these? Here are some follow-up questions for you:

1. What would 50% of 3000 m² be?
2. How can we calculate 10% of any number quickly?
3. What is the difference between calculating 100% and 150% of a value?
4. Can you explain why percentages greater than 100% increase the original value?
5. How would you calculate 90% of 520?

**Tip:** To quickly calculate 10% of a number, just move the decimal point one place to the left!

Calculer: a) 25 % de 520 b) 5 % de 90 mg c) 75 % de 3000 m² d) 150 % de 400 cL

This exercise covers calculating percentages of different values such as 25% of 520, 5% of 90 mg, 75% of 3000 m², and 150% of 400 cL. Learn the step-by-step process to solve these common percentage problems, suitable for middle school students (Grades 6-8).

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