4/4 = 100%
The fraction 4/4 represents a complete amount, or 100%. You might see this when all four homework questions are correct, every seat in a small theater is filled, or a project is fully finished.
To picture 4/4 quickly, imagine four equal parts with all four shaded or checked off. It is the same as having the whole thing, so you can recognize it as complete at a glance.
A common mistake is thinking 4/4 is larger than one because the numbers look large. Since the numerator and denominator are the same, the fraction means one whole, not four wholes.