You take the two numbers that are the smallest and add those together to see if the make the bigger number. If they do, good job, you got it right. If they don't check your math.
By doing it in reverse.
96 - 35 = 61 because 61 + 35 = 96
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No, the answer in a subtraction problem is the difference.
It is still a subtraction problem.
Add the result to the number you were subtracting; if this equals the original number then the subtraction is likely to be correct. example: if you calculated 123 - 56 and get the result 67, check by working out 67 + 56 and see if you get 123.
You don't. You can check addition with subtraction or subtraction with addition, since subtraction is the opposite of addition. Similary, you can check division with multiplication, or vice versa.
Subtraction, like addition, results in a sum.