What is the largest number in this set: 2.5, 3.1, 2.8, 3.0?

The largest number in the set is 3.1.

To determine the largest number in a set, we compare each number to find the one with the highest value. In this set, we have the numbers 2.5, 3.1, 2.8, and 3.0. Let's analyse each number step by step.

First, we compare 2.5 and 3.1. Since 3.1 is greater than 2.5, we can eliminate 2.5 from being the largest number. Next, we compare 3.1 with 2.8. Again, 3.1 is greater than 2.8, so 2.8 is also not the largest number. Finally, we compare 3.1 with 3.0. Since 3.1 is greater than 3.0, we can conclude that 3.0 is not the largest number either.

By comparing each number in the set, we find that 3.1 is the highest value. This method of comparison ensures that we accurately identify the largest number. Understanding how to compare numbers is a fundamental skill in mathematics, and it helps in various real-life situations, such as analysing data or making decisions based on numerical information.