Two topics explained here:
(1) Using the least common multiple of the denominators when adding fractions; and
(2) How to find the least common multiple of two numbers by using the prime factorization of the numbers.
This lesson is intended for 6th grade (and onward). The first part of the lesson explains what is the least common multiple and gives examples of how to find it:
Check out also the free Math Mammoth books and worksheets you can find here:
Tagged under: common multiple,lcm,prime factorization,fraction addition, common denominator,6th grade,math
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