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adding fractions is like adding a WHOLE lot of parts of numbers
There are always 15 numbers in a FedEx tracking number. Ship items a lot, the first 11 numbers will not change each time you make a shipment. Only the last four will and you can even predict the tracking numbers by adding seven to a current tracking number.
There are five ways of simply adding the numbers but a lot more if other operators are allowed. For example, 6*2 + 4 = 16 or 5*3 + 6/6 = 16.
What do I know about negative numbers? A lot.
There is no general formula. You need to measure it or else have a lot more information.