The number 121 is a palindrome, because it reads the same backwards as forward. How many integer palindromes are between 100 and 500?
The integer is between 100 and 500, and the hundreds and ones digit have to be the same. The hundreds digit and the ones digit have the numbers 1-4 to choose from.
The tens digit can be any number from 0-9, which means it has 10 numbers to choose from.
4*10 = 40 integer palindromes.