110
Assuming you mean digits and not didgets, the answer is 6.
36
20 number
add numbers below to each number at the top
Two-digit prime numbers whose digits add up to 10 are:193773
Assuming you mean digits and not didgets, the answer is 6.
36
300
139
5 odd numbers CAN'T add up to an even number like 50
20 number
Multiples of 3 are easy to identify. Their digits add up to a multiple of 3.
51
17
Since we are talking for the sum of digits, then we are talking about 2-digit numbers between 1 and 100, which are 90 numbers (10 to 99). From these numbers only half of them satisfy the above condition, that is 45 numbers. So 50% of 2-digit numbers between 1 and 100 have an odd sum of their digits.
There are a variety of three digits that add up to 25. Examples include 9, 8 and 8.
None. The only way for it to be possible would be 3 zeros which is not considered a 3 digit numbers.