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