How do you write 23 using only the number 2?

34 using only the number 3?

56 using only the number 5?

100 using only the number 9?

By using fractions. 22+2/2=23, 33+3/3=34, 55+5/5=56, 99+9/9=100

I'm as light as a feather yet an average man can't hold me more than one minute. What am I?