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2, 3, 5 and 7. 1 is NOT a Prime number and 2 is the only even prime.
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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.
What is the sum ratio of the number of one digit prime numbers and the number of one digit composite numbers?
There are four of each.
How many positive prime numbers have a ones digit of 5?
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.
How many 2 digit prime numbers are there?
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.
How many two digit prime numbers have a units digit of 7 and what are the prime numbers?
17, 37, 47, 67, 97
