Answer :

Sure, let's go through the steps to arrange the given numbers in descending order.

The numbers given are:
0.2, 0.6, 2.50, and 0.04.

### Step-by-Step Solution:

1. List the Numbers:
- 0.2
- 0.6
- 2.50
- 0.04

2. Compare the Numbers:
- To arrange these numbers in descending order, we need to compare each pair of numbers to determine which number is larger.

3. Arrange the Numbers:
- First, compare all the numbers to find the largest one:
- 2.50 is larger than 0.6, 0.2, and 0.04.
- Next, find the largest number among the remaining:
- Between 0.6, 0.2, and 0.04, the largest is 0.6.
- Then, find the largest number between the two remaining:
- Between 0.2 and 0.04, the largest is 0.2.
- Finally, the last number remaining is 0.04.

4. Order the Numbers:
- Based on the above comparisons, we can organize the numbers in descending order:
- 2.50 (largest)
- 0.6
- 0.2
- 0.04 (smallest)

### Result:
So, the numbers 0.2, 0.6, 2.50, and 0.04 arranged in descending order are:
[tex]\[ 2.5, 0.6, 0.2, 0.04 \][/tex]