**How to find the LCD**

When you add fractions the denominators of the fractions need to be equal.

For example, when you add 1/4 plus 1/2 you need to find a lowest common denominator.

Follow these steps to find the

**least common denominator.****Step 1.**Create a factor tree for each denominator.

**Step 2**. Write the prime factors in a chart. ( You can see an example in the video)

**Step 3.**Multiply the prime numbers in the chart but if you have pairs of the prime numbers then only multiply one number.

**Step 4.**The sum of multiplying the numbers together is the LCD.

**Step 5.**Divide the LCD by the denominator and multiply the numerator by this answer.

**Example Problem**

1/4 + 1/2

The LCD is 4

4/4 = 1 and 1 x 4 = 1 so you get 1/4

4 divided by 2 = 2

1 x 2 = 2 so you get 2/4

1/4 + 2/4 = 3/4

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