Write the missing numbers on each line. Draw lines between matching decimals and fractions.

The number line from 0 to 1 is divided into 10 equal parts.
Each part represents $\frac{1}{10}$ or 0.1.

• The first missing number is 2 increments from 0: $0 + 2 \times 0.1 = 0.2$.
• The second missing number is 1 increment from 0.5: $0.5 + 1 \times 0.1 = 0.6$.
• The third missing number is 2 increments from 0.5: $0.5 + 2 \times 0.1 = 0.7$.

The missing numbers are $\boxed{0.2}$, $\boxed{0.6}$, and $\boxed{0.7}$.

2. Write the missing numbers on each line (3 to 4).

The number line from 3 to 4 is divided into 10 equal parts.
Each part represents $\frac{1}{10}$ or 0.1.

• The first missing number is 1 increment from 3: $3 + 1 \times 0.1 = 3.1$.
• The second missing number is 2 increments from 3: $3 + 2 \times 0.1 = 3.2$.
• The third missing number is 1 increment from 3.5: $3.5 + 1 \times 0.1 = 3.6$.
• The fourth missing number is 2 increments from 3.5: $3.5 + 2 \times 0.1 = 3.7$.
• The fifth missing number is 3 increments from 3.5: $3.5 + 3 \times 0.1 = 3.8$.

The missing numbers are $\boxed{3.1}$, $\boxed{3.2}$, $\boxed{3.6}$, $\boxed{3.7}$, and $\boxed{3.8}$.

3. Draw lines between matching decimals and fractions.

• Top row:
  • $\frac{1}{10} = 0.1$
  • 5.5
  • $\frac{7}{10} = 0.7$
  • 0.3
  • $\frac{1}{2} = 0.5$
  • 0.1
  • 2.4
• Bottom row:
  • 0.7
  • $2\frac{4}{10} = 2 + \frac{4}{10} = 2 + 0.4 = 2.4$
  • 2
  • 0.5
  • $\frac{3}{10} = 0.3$
  • $5\frac{1}{2} = 5 + \frac{1}{2} = 5 + 0.5 = 5.5$

• 5.5 (top row) matches $5\frac{1}{2}$ (bottom row).
• $\frac{7}{10}$ (top row) matches 0.7 (bottom row).
• 0.3 (top row) matches $\frac{3}{10}$ (bottom row).
• $\frac{1}{2}$ (top row) matches 0.5 (bottom row).
• 2.4 (top row) matches $2\frac{4}{10}$ (bottom row).

The matching pairs are:

• $\boxed{5.5 \leftrightarrow 5\frac{1}{2}}$
• $\boxed{\frac{7}{10} \leftrightarrow 0.7}$
• $\boxed{0.3 \leftrightarrow \frac{3}{10}}$
• $\boxed{\frac{1}{2} \leftrightarrow 0.5}$
• $\boxed{2.4 \leftrightarrow 2\frac{4}{10}}$