On a piece of graph paper draw the points (3,1), (6,2), (4,3), (5,2), and (2,1).
For each of those points, draw a line from the origin (0,0) to that point.
The 2 fractions with the same value are the 2 fractions on the same line.
It's 1/3 and 2/6.
Without drawing lines you can do this:
You can multiply anything by 1 and it won't change.
1/3 * 1 = 1/3
Any number over itself equals 1, so you can do this:
1/3 * 2/2 = 2/6
1/3 = 2/6