To be honest, numbers go on and on. (they never stop). So it's infinite. The least number would be Negative ( - ) About zillions of digits of numbers.
This is known as arranging the numbers in ascending order.
Listing the fractions is ascending (or descending) order.
the range
When you arrange a set of numbers and asked to put them from least to greatest, it means you have to put the smallest number first, then the second smallest, etc. if you were given 8, 34, 1, 17, 22,...