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How many one-digit counting number?
9.
Is the single digit number greater than 9?
There is no single digit number greater than 9. After 9 is 10, which is a double-digit number.
What is the Units Digit of 9 to the 21st?
The number in the units digit of the number 921 is 9.
How many different 7 digit phone number are possible if the first digit cannot be 0?
9*106 or 9 million.
How many palindromes are between 100 and 10000?
For the group of 3 digit numbers : Any number from 1-9 can be the 1st digit, any number from 0-9 can be the 2nd digit, the 3rd digit can only be one number that matches the 1st digit. The number of possibilities is thus, 9 x 10 x 1 = 90. For the group of 4 digits : Any number from 1-9 can be the 1st digit, any number from 0-9 can be the second digit, the 3rd digit can only be the one number that matches the 2nd number, and the 4th digit can only be the one number that matches the 1st digit. Number of possibilities is 9 x 10 x 1 x 1 = 90. Giving a total of 180 palindromic numbers between 100 and 10000.
