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Let's go through the questions visible in the image and solve them step by step:

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### **6. Convert the fractions into decimal numbers:**

- **(a) \( \frac{1}{2} \)**:
  \[
  \frac{1}{2} = 0.5
  \]

- **(b) \( \frac{8}{5} \)**:
  \[
  \frac{8}{5} = 1.6
  \]

- **(c) \( \frac{7}{20} \)**:
  \[
  \frac{7}{20} = 0.35
  \]

- **(d) \( \frac{-12}{50} \)**:
  \[
  \frac{-12}{50} = -0.24
  \]

- **(e) \( \frac{-8}{16} \)**:
  \[
  \frac{-8}{16} = -0.5
  \]

---

### **7. Convert the mixed numbers into decimal numbers:**

- **(a) \( 5 \frac{1}{2} \)**:
  \[
  5 + \frac{1}{2} = 5 + 0.5 = 5.5
  \]

- **(b) \( 3 \frac{3}{5} \)**:
  \[
  3 + \frac{3}{5} = 3 + 0.6 = 3.6
  \]

- **(c) \( 6 \frac{3}{4} \)**:
  \[
  6 + \frac{3}{4} = 6 + 0.75 = 6.75
  \]

- **(d) \( -15 \frac{6}{25} \)**:
  \[
  -15 + \frac{6}{25} = -15 + 0.24 = -14.76
  \]

---

### **8. Convert the fractions into decimals and calculate the expression:**

- **(a) \( \frac{17}{10} - 1.3 \)**:
  \[
  \frac{17}{10} = 1.7, \quad 1.7 - 1.3 = 0.4
  \]

- **(b) \( \frac{14}{5} - 0.3 \)**:
  \[
  \frac{14}{5} = 2.8, \quad 2.8 - 0.3 = 2.5
  \]

- **(c) \( 6 \frac{7}{10} - 1.9 \)**:
  \[
  6 \frac{7}{10} = 6.7, \quad 6.7 - 1.9 = 4.8
  \]

- **(d) \( 9.05 + \frac{3}{4} \)**:
  \[
  \frac{3}{4} = 0.75, \quad 9.05 + 0.75 = 9.8
  \]

---

Would you like more details on any step or have any questions?

Here are some related questions you could try:

1. Convert \( \frac{9}{8} \) into a decimal.
2. What is \( 7 \frac{5}{6} \) in decimal form?
3. Calculate \( 4 \frac{1}{5} - 2.3 \).
4. Convert \( \frac{-16}{9} \) into a decimal.
5. What is \( 8.5 + \frac{2}{3} \)?

**Tip**: When converting a fraction to a decimal, divide the numerator by the denominator directly for an accurate result.

Solve the problems involving converting fractions and mixed numbers into decimal numbers and performing calculations with them.

Learn how to convert fractions and mixed numbers into decimal numbers and solve related problems with step-by-step solutions. This exercise includes addition and subtraction of decimal numbers.

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