Subtracting a number by itself will leave you with 0, whereas dividing leaves 1. So dividing a number by itself will give the larger result.
The rule for significant figures is that when adding, subtracting, dividing, or applying any mathematical treatment, one cannot calculate a result that has more significant digits than that of the input with the least number of significant digits. This is because any result cannot be more accurate than the least accurate input.
a number lower than the original number
Depends. If you are subtracting a bigger number from a smaller number, such as 3 - 5, you will get a negative result, -2. If you are subtracting a smaller number from a bigger number, such as 12 - 3 you will get a positive result, 9.
The result of subtracting 2 numbers is the difference.
No, reversing the order of the digits of a two-digit prime number does not always result in a prime number.
adding its opposite?