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## Question:

To find LCD by prime numbers, you should A. take numerators and arrange in a row. B. first take denominators and arrange in a row. C. continue division until no prime number will divide into at least three numbers. D. divide numerators by the highest prime number.

## Answer:

The correct option to find **LCD** **by prime numbers** is;

*Option C; continue division until no prime number will divide into at least three numbers. *

**LCD**simply means**lowest common denominator**. Now, when we are looking for lowest common denominator by**prime numbers**, we are simply trying to look for the least common denominator that is a**product**of the**common***prime factors*of the numbers we are looking for LCD.

Now, let’s say we want to find the LCD of;

1/12 + 1/54 + 1/90

Let us divide each by the first prime factor which is 2;

12/2 = 6

54/2 = 27

90/2 = 45

- Now, we will
**repeat**the**division**again using 2 again and we will continue using 2 and other**relevant prime numbers**in this process until no result is a product of more than 3 prime numbers.

Thus, the correct option is option C.

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