To order a set of numbers from least to greatest,

compare each number to the other numbers in the set.

First, compare the digits in the hundreds place of each number.

2 is less than 6, so 256 and 265 are less than 652.

Next, compare the digits in the tens place of 256 and 265.

5 is less than 6, so 256 is less than 265.

256 is less than 265, which is less than 652.

So, the numbers in order from least to greatest are 256, 265, 652.