Simplify.
12/16=
6/18=
12/18=
8/20=
10/20=
12/16= 3/4
6/18= 1/3
12/18= 2/3
8/20= 2/5
10/20= 1/2
but how?
for example
12/18= 2*2*3 / 2*3*3 = 2/3
or
10/20 = 2*5 / 2*2*5 = 1/2
To simplify a fraction, you need to find the greatest common divisor between the numerator and the denominator, then divide both by that common divisor. In your examples:
12/16 = 12/16 = 3*2*2 / 2*2*2*2 = 3/4
6/18 = 6/18 = 3*2 / 3*3*2 = 1/3
12/18 = 12/18 = 3*2*2 / 3*3*2 = 2/3
8/20 = 8/20 = 2*2*2 / 2*2*5 = 2/5
10/20 = 10/20 = 2*5 / 2*2*5 = 1/2
It's important to simplify fractions in order to express them in their simplest form.