Identify GCD: Identify the greatest common divisor (GCD) of the numerator and the denominator.The GCD of 20 and 42 is 2, because 2 is the largest number that divides both 20 and 42 without leaving a remainder.
Divide by GCD: Divide both the numerator and the denominator by the GCD to simplify the fraction.(20÷2)/(42÷2)=10/21
Check for further simplification: Check if the fraction can be simplified further. The numbers 10 and 21 do not have any common divisors other than 1, so the fraction is now in its simplest form.
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