Explain how u put these numbers 2.909, 2.912,2.830, 2.841 from least to greatest

Well you see that they are all 2 so go on to the next part you have two 2.9 and two 2.8  . since the 2.8 s are smaller you continue with them and you have a 2.83 and a 2.84; 3 is smaller than 4 so the 2.830 will be the least and the 2.841 will come next. now you go back to those 2.9 s and continue. you have a 2.91 and a 2.90. 0 is less than 1 so 2.909 will come next and 2.912 will be last .

2.830; 2.841;  2.909; 2.912