51,52,53,54,55,56,57,58,59.
They start with the letter t.They are two-digit numbers.They are not prime.They start with the letter t.They are two-digit numbers.They are not prime.They start with the letter t.They are two-digit numbers.They are not prime.They start with the letter t.They are two-digit numbers.They are not prime.
All of the odd numbers between 11 and 99 inclusive are two digit numbers that are not multiples of 2. There are 45 of them.
20 and 30 All numbers have at least one common factor.
72. (with the range of two digit numbers being from 10 to 99).
The smallest two-digit odd number is 11. It is the first odd number that falls within the range of two-digit numbers, which start from 10.
13,23,33,43,53,63,73,83,93
The sum is 22 times the sum of the three digits.
16 (42), 25 (52), 36 (62), 49 (72), 64 (82), and 81 (92) are all two-digit square numbers.
The greatest sum of two two-digit numbers occurs when you add the largest two-digit numbers together. The largest two-digit number is 99. Therefore, the greatest sum of two two-digit numbers is 99 + 99, which equals 198.
There are 21 two-digit prime numbers.
945
Three-digit numbers start at 100. Two-digit numbers start at 10. So out of 1 - 99, the first 9 don't count. That leaves 99 - 9 = 90.