Example: 25/45, 15/27 Form a proportion.
First, find the GCF (Greatest Common Factor) of 25 and 45.
25: 1,2,4, (5) ,10,20,25,50,100
45: 1,3, (5) ,9,15,45.
The GCF for 25 and 45 is 5.
Divide 5 by the numerator and denominator:
25÷5= 5
45÷5= 9.
So, 25/45=5/9.
Now for 15/27. Find the GCF for the numerator and denominator:
15: 1, (3) ,5,15
27: 1, (3) ,9,27
The GCF for 15 and 27 is 3.
Divided the numerator and denominator by 3
15÷3=5
27÷3=9.
15/27=5/9.
(Should have given another example like cross products which would further add to the answer being 5/9?)