There are an infinite number of them.
Here are a few:
2/8, 3/12, 6/24, 10/40, 22/88, 9/36,
31/124, 123/492, 500/2000, 198/792
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Here's how you can make as many of them as you want:
-- Pick any number. Write it on top of a new fraction.
-- Multiply your number by 4. Write the product
on the bottom of the new fraction.
Now your new fraction is equivalent to 1/4 .