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You can do that on any calculator. Just keep dividing both numerator and denominator until it reaches a point where they cannot be simplified further on.

However, to answer your question,

\(\frac{84}{16} = \frac{42}{8} = \frac{21}{4}\).

So our answer would be \(\boxed{\frac{21}{4}}\). If you wanted it in a mixed number, it would be \(\boxed{5\frac{1}{4}}\).

Without any difficult culculations you can transform your significant number into simple 21/4.