18/42 = 9/21 = 3/7
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63/100 is the simplest form for your fraction.
4/15 is the most reduced form of that fraction with integer numerator and denominators.
84/210 = 2/5
Reduced to a proper fraction in its simplest form by dividing both sides of the fraction by 9, 9/27 is equal to 1/3, or one third.
Since the numerator of the fraction is prime, and 7 is not a factor of 16, the proper fraction 7/16 cannot be reduced any further and is in its simplest form.