Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.
The sum of all digits is 45.
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It means that you are talking about numbers that have more than one digit.
2, 3, 5, and 7 are the only one-digit prime numbers.
None. 3 digit numbers are not divisible by 19 digit numbers.
The basic idea is the same as when you estimate sums and differences of larger numbers (which may or may not be integers). You round the numbers to one or two decimal digits, then add them up.
3 digit numbers are lessthan 4 digit numbers