Order number from least to greates

9/5 - 2.5 - 1.1 - 4/5 0.8

Step-by-step explanation:

Start by writing these five numbers in just one format (improper fractions with denominator 10):

9/5 = 18/10, and

-2.5 = - 25/10, and

-1.1 = - 11/10, and

-4/5 = - 8/10, and, finally

0.8 = 8/10

The smallest of these (the least) is - 25/10, and

the largest is 18/10.

Arranged in ascending order, we have:

-25/10, - 11/10, - 8/10, 8/10, 18/10, or

-2.5, - 1.1, - 4/5, 0.8, 9/5