Answer :
Because this i s what my teacher taught me
What it's divisible by
2x 4 is divisible but not 9
3x none are divisible by three
4x only 4
And you only go up to the numerator there for 4/9 is in simplest form
What it's divisible by
2x 4 is divisible but not 9
3x none are divisible by three
4x only 4
And you only go up to the numerator there for 4/9 is in simplest form