Make sure that whatever you're reducing is a fraction, either proper or improper. Find the GCF of the numerator and the denominator. If the GCF is greater than 1, divide both the numerator and the denominator by it. If the GCF is 1, the fraction is in its simplest form.
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The lowest term has already been reduced as far as it will go. It is not possible to reduce it further.
As a fraction in its lowest terms: 67/100
3.12 as a fraction in its lowest terms is 78/25. (The mixed number equivalent is 33/25).
Write the number before the decimal point as the whole number and the bit after the decimal point as a fraction over 100, then reduce to lowest terms: 9.45 = 945/100 = 99/20
when you add mixed numbers you have a whole number but adding fraction does not.