list these from largest to smallest:

39.95, 4.00, 83.80, 20.18

83.80

39.95
20.18
4.00

To list the given numbers from largest to smallest, we can compare them and sort them in descending order. Let's do that step by step:

1. Compare 39.95 and 4.00:
- 39.95 > 4.00

2. Compare 39.95 and 83.80:
- 83.80 > 39.95

3. Compare 83.80 and 20.18:
- 83.80 > 20.18

Thus, the list from largest to smallest is: 83.80, 39.95, 20.18, 4.00.