The final digit in a measuring is the least reliable because it's the smallest fraction of the number. For instance, if you had 1,750,876.03 the 3 cents wouldn't really matter much would it?
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256.000
repeating
The final sum is 9
No - 505/2 = 252.5. Note that any number with the final digit 2, 4, 6, 8, or 0 will be divisible by 2, while any number with the final digit 1, 3, 5, 7, or 9 will not be divisible by 2.
To be an even number then the final digit = 2. The largest single prime digit is 7 (as both 8 and 9 are composite). The greatest even number fulfilling the conditions is 77777772.