Remember that the word "of" means to multiply. So 1/10 of 100 is the same as saying (1/10)x(100) which is also the same as (1/10)(100/1)
Now that you have the expression (1/10)(100/1) you can solve by multiplying the numerators together and the denominators together. The result should be 100/10
100 divided by 10 is 10 so your final answer should be
10