How do you reduce 22 over 99?

22/99

Both numbers are products of '11'.

So divide ( cancel down/reduce) by '11'

Hence

22/99/ = 2/9

As a decimal it is '0.2222....' ( recurring to infinity).

NB Remember from you '11' times tables.

2 x 11 = 22

9 x 11 = 99

et seq.,