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There are 21 two-digit prime numbers. The first two-digit Prime number is 11, and the last two-digit prime number is 97. Prime numbers are numbers greater than 1 that are only divisible by 1 and themselves.
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How many 2 digit prime numbers are there whose unit digit is greater its tens digit?
Ten.
What are the two smallest 2 digit prime numbers that have the digit 2?
23 and 29
What is the difference between the greatest and smallest 2-digit prime numbers?
11 is the smallest 2-digit prime number and 97 is the greatest 2 digit prime number, so their difference is 86
Two prime numbers between 100 and 199 such that the tens digit is a prime number and the tens and ones digit taken together are a 2 digit prime number find the sum of these two prime numbers?
For the tens digit to be a prime number then it must equal 2, 3, 5 or 7. There are four 3-digit prime numbers that fit the above condition and also have the tens and units digits forming a 2-digit prime number. 131, 137, 173, 179. The person supplying the question may like to sum the various combinations.
What is the ratio of the number of one-digit prime numbers and the number of one-digit composite numbers?
The ratio of the number of one-digit prime numbers to the number of one-digit composite numbers is one to one. The one-digit prime numbers are 2, 3, 5, and 7. The one-digit composite numbers are 4, 6, 8, and 9. Therefor, the ratio is 4:4, which simplifies to 1:1.
