**Least common factor prime** means two or more number divided the common number such that **4 and 16** we have the smallest **prime number 2** which divided the number** 4 and 16** at the **same time.**

After dividing the number** 4 and 16** by prime common factor** 2**.and **saver number 2 and 8.**

Then again we divide 2 and 8 by same number 2.and saver number is 1 and 4 other we cannot divide the common factor.

Then the resulting l**east common prime factor of 4 and 16. ** Is **2 ×2 = 4**

**FIRST:**

First we take the factor** 4 and 16** then we see the prime factor of** 4 and 16**

4 has factors 1,2,4

16 has factors 1,2,4,8,16

**SECOND:**

we see that the factor of 4 and 16

4 has factored only 2

16 has factors also only 2

**THIRD:**

we see that the common **p factor 4 and 16 is 2**

**FOURTH:**

We divide these number** 4 and 16** from factor by 2 processes again and again by prime factor 2.

**FOR EXAMPLE:**

We fined the least common factor (L. C. M) of 15 and 21 by using the prime factor method.

SOLUTION:

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