if the spinner is to be spun once how likely will it stop on a multiple of 9

There are 10 possible outcomes when spinning a spinner once (numbers 1 through 10).

Out of these 10 outcomes, only the numbers 9 and 10 are multiples of 9. Therefore, the probability of the spinner stopping on a multiple of 9 is 2/10, or 1/5, or 20%.