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Divide the least common multiple, LCM, calculated above, by each fraction's denominator, in order to calculate each fraction's expanding number.The expanding number is the non-zero number that will be used to multiply both the numerator and the denominator of each fraction, in order to build all the fractions up to the same common denominator.Calculate each fraction's expanding number: Calculate LCM, the least common multiple of numbers.The least common multiple, LCM, is the product of all the unique prime factors of the denominators, taken by the largest exponents.Factor all the new denominators of the reduced fractions (run the prime factorization).LCM is going to be the common denominator of the added fractions.Calculate the least common multiple, LCM, of all the fractions' new denominators: Reduce (simplify) fractions online to their lowest terms, with explanations.Divide the numerator and the denominator of each fraction by their greatest common factor, GCF - after this operation the fraction is reduced to its lowest terms equivalent.Calculate online the greatest common factor, GCF.GCF is the product of all the unique common prime factors of the numerator and the denominator, taken by the lowest exponents.Calculate GCF, the greatest common factor (also called GCD, greatest common divisor, HCF, greatest common factor) of each fraction's numerator and denominator.Factor numbers online down to their prime factors.Factor the numerator and the denominator of each fraction down to prime factors (prime factorization).Reduce the fractions to the lowest terms (simplifying). To add fractions with different denominators (unlike denominators), build up the fractions to the same denominator.
#Add and subtract fractions calculator how to#
How to reduce (simplify) the common fraction 12/ 18?ī.The denominator of the resulting fraction is: 18.We simply added the numerators of the fractions: 3 + 4 + 5 = 12.
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