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Help With Fractions With Least Common Denominator Using Primes
A prime number is a whole number (integer) whose only factors are itself and one. The first prime numbers are: 1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, . . . .
By dividing by primes, you can find that the primes of 105 are:

A systematic way of finding the prime factors of larger positive integers is illustrated below. The primes are tried in order, as factors, using each as many times as possible before going on to the next. The result in this case is:

To add several fractions with different denominators, follow these steps:
Step 1: Express denominators in prime factors.
Step 2: Determine the least common denominator by using all of the prime numbers from the largest denominator, and then include each prime number from the other denominators so that each denominator can be calculated from the list of primes contained in the LCD.
Step 3: Rewrite using the least common denominator.
Step 4: Add the fractions.



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