Question

reduce the fraction 20/100

Answer 1

I assume you meant 20% OF 100, not just 20%.

Write the problem.
20%(100)

Rewrite 20% as 1/5.
1/5(100)

Multiply.
20

Rewrite it as a improper fraction.
20/1

So the answer is 20/1.

If you meant 20%, then the answer is 20/100 or 1/5.