How many multiples of 10 are between 9 and 101?
I know that the multiples of 10 are the numbers that end with a zero, like 10, 20, 30, and so on. The first multiple of 10 that is greater than 9 is 10 itself, and the last one that is less than 101 is 100. So, I need to count how many numbers are in the list 10, 20, 30, ..., 100. One way to do this is to divide each number by 10 and get a new list: 1, 2, 3, ..., 10. This list has 10 numbers, so there are 10 multiples of 10 between 9 and 101. 