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Well, if you think about it, a prime can never end in 4, because then it would be divisible by 2.

So the only numbers you need to check are 41, 43, 45, 47, and 49. Can you take it from there?

Q: How many 4's are used to write all two digit prime numbers?

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There are 21 two-digit prime numbers.

There are 17 such numbers.

24 of them.

there are 4

There are 5 of them.

Related questions

There are 21 two-digit prime numbers.

There are 17 such numbers.

17, 37, 47, 67, 97

An on-line prime number chart ended at 10007. There are many more charts available for download. So the answer is that there are many five digit prime numbers.

there are 50 prime numbers between 1-100 and of them 2,3,5,7 are single digit so that would leave 46 double digit prime numbers between 1-100

24 of them.

Ten.

4: 2, 3, 5 and 7. 1 is not a prime.

there are 4

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 5 of them.

3 numbers 2, 23 and 29