The same way as whole numbers.
0.3865 + 0.2274 could be estimated as 0.40 + 0.20 = 0.6
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
7.8+31.39+6.95
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
rounding
1423832
It depends on your level of numerical skill. You can convert the decimal to an approximate fraction and estimate the sum of the two fractions, or you can convert the fraction to an approximate decimal and estimate the sum of the two decimals or, if you are more able you just estimate their sum directly.
54+86
The answer is -30.
Sum is an answer to an addition problem.
3
0.7 0.5