9
90
126
These two numbers: 135 and 180.
3 and 9 are both 'natural' numbers.
9
Overall, there are 99900 numbers between 100 and 100000, not including 100 itself. One out of every ten of them ends with a nine, which leaves us with 9990 numbers. It is easier to understand this for small numbers - say we look for the corresponding number between 10 and 100. We have overall 90 numbers, 9 of them end with the digit 9: 19,29,39,49,59,69,79,89,99.
There are 9.
150 ÷ 9 = 16 r 6 → the first natural number between 150 and 300 divisible by 9 is 9 × 17 (=154)300 ÷ 9 = 33 r 3 → the last natural number between 150 and 300 divisible by 9 is 9 × 33 (=297)→ there are 33 - 17 + 1 = 17 natural numbers between 150 and 300 divisible by 9.
90
8 numbers
126
4, 9, 25, and 49 are all of the numbers between 1 and 100 having 3 factors.
These two numbers: 135 and 180.
3 and 9 are both 'natural' numbers.
9
There are 9 numbers between 10 and 100 that are divisible by 11. They are: 11, 22, 33, 44, 55, 66, 77, 88, and 99