SOLUTION: When your estimating by clustering how do you know to keep it the same or round it up? For example 8.7+3.21+3.889?

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Question 17547: When your estimating by clustering how do you know to keep it the same or round it up? For example 8.7+3.21+3.889?
Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
If the digit is 0, 1, 2, 3, 4 ---> round down
If the digit is 5, 6, 7, 8, 9 --> round up

8.7 + 3.21 + 3.889
= 9 + 3 + 4
= 16