You check it by subtracting one of the numbers you added by the sum and if it is the same number that you added, than it is correct.
ex. 233 + 9,996= 10,229
check: 10,229 - 233= 9,996
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A reasonable estimate of the sum of 78 and 119 is 197.
sum means the answer of a math problem
A sum is the answer to addition
It means the same in math as it means else where--it means not reasonable. If you show mathematical steps that are not reasonable to solve a math problem or show a math proof, then your math is unreasonable.
i think reasonable means in math if its worth any value such as the 0 its worth no value