The same way as whole numbers.
0.3865 + 0.2274 could be estimated as 0.40 + 0.20 = 0.6
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The sum is 2.05 and you don;t need to estimate such a simple sum!
2.0999999999999996
Sum is the result of an addition problem, while difference is the result of a subtraction problem. Addend Subtractend + Addend - Subtractor Sum Difference
1423832
54+86