Which number is greater among 1.0, 0.856, 0.99, and 0.12?

Given numbers are: 1.0, 0.856, 0.99, and 0.12

First, compare the whole part of the decimal number.

In 1.0, the whole part is 1.

In 0.856, 0.99, and 0.12, the whole part is the same, i.e., 0.

We know that the whole number part with a greater number will be greater.

Therefore, 1.0 is greater among all the given numbers.