Why we estimate: The reasons why we estimate are
To get closer to an answer
To make a problem easier
And to know what to expect from a calculation
You have 1.36L of OJ and theres 4 people that you need to share it to. How much OJ does each person get?
One way to do it is you round the 1.36L to 1L. Then if you divide it by 4 it equals 0.25. Then if you get the .36 and divide it by 4 you get 0.9 and if you add that with the 0.25 you get 0.34L. So everyone will get 0.34L of OJ.
Picture of a number line