Prime numbers greater than 10 will only end in 1, 3, 7 or 9.
How about: 11, 13, 17, 19 .... etc
29
Any prime number greater than 10 is an odd number but cannot end in 5 as this makes it divisible by 5. Therefore the ones digit of any prime number greater than 10 must be 1, 3, 7 or 9.
There are 800 such numbers.
Prime numbers greater than 10 will only end in 1, 3, 7 or 9.
How about: 11, 13, 17, 19 .... etc
91
16
Only one positive prime number has a 5 in the ones digit. That prime number is 5. All other numbers with a 5 in the ones digit are composite because they will be divisible by 5.
There are 45 of them.
The ones digit in the product from multiplying the 305 prime numbers less than 2012 is 0 because the ones digit becomes 0 after 2 and 5 have been multiplied and remains unchanged after more prime numbers are multiplied.
89 is a prime number between 70 and 100 that has the ones digit one greater than the tens digit.
Probably 73.
29
Any prime number greater than 10 is an odd number but cannot end in 5 as this makes it divisible by 5. Therefore the ones digit of any prime number greater than 10 must be 1, 3, 7 or 9.
The answer depends on what the tens digit is greater than, and what the ones digit does then.