How many 9′s are there between 1 and 100?

Answer: 20

More Math Riddles with answers

More Math Riddles

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I am a place, in a state. I am an answer to a math problem. The math problem is: To get a cube, you multiply something by 6. What do you multiply by?
I am a three-digit number. All of my digits are prime. One of the numbers is even. Each of my numbers are used only once. The total of my first and last digits equals 10. The total of my first two digits equals 5.
I am a two-digit number. All my digits are even. No two digits are the same. None of my digits are prime numbers. I am not a multiple of ten. My tens digit is bigger than my other numbers. If you followed all the previous steps, there should be three options remaining the number is the option where if you add all the digits it's exactly in the middle (in how big the number is) of all the other options with their digits added together. What number am I?
I am an odd number, take away two letters and I am even
I am an odd number. Take away one letter and I become even. What number am I?
I am as simple as a circle, worthless as a leader; but when I follow a group, their strength increases tenfold. By myself I'm practically nothing. What am I?