Write all even number from 1 to 20. What fraction of them are multiples of 4?

Answer

### Step-by-Step Solution:

**Step 1: Identify and list all even numbers from 1 to 20.**
- The even numbers between 1 and 20 are:
2, 4, 6, 8, 10, 12, 14, 16, 18, 20.

**Step 2: Count the total number of even numbers.**
- There are 10 even numbers in total.

**Step 3: Identify the multiples of 4 among the even numbers.**
- The multiples of 4 from the list of even numbers are:
4, 8, 12, 16, 20.

**Step 4: Count the number of multiples of 4.**
- There are 5 multiples of 4.

**Step 5: Calculate the fraction of even numbers that are multiples of 4.**
- The fraction is given by the formula:
\[ \text{Fraction} = \frac{\text{Number of multiples of 4}}{\text{Total number of even numbers}} = \frac{5}{10} \]

**Step 6: Simplify the fraction.**
- Simplifying \(\frac{5}{10}\) gives us \(\frac{1}{2}\).

### Final Answer:
The fraction of even numbers from 1 to 20 that are multiples of 4 is \(\frac{1}{2}\).

---