I am not sure what you mean by simplify. If you mean round, then it is usually done by using "fixed format" to limit the number of decimal places displayed. Different calculators have different procedures for doing this.
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A calculator can convert numbers that appear as decimals into numbers that appear as fractions. Fractions are generally considered more easy to use then decimals.
use a calculator
Use a calculator
you can round to a certain point, or turn them into fractions and simplify.