Respuesta :

mika1537
the simplest form of 21:28 is 3:4. you just divide both numbers by the greatest common factor.
kawaiipotato233

Answer:

3/4

Step-by-step explanation:

You need to find the greatest factor. Divide it with both denominator and numerator by the greatest factor in order to simplify the form.

OR..

you can use your Tl-30XIIS calculator and do.. "21 A b/c ( the button) 28"