### Examples

**Example 1:** Find the LCM of 4 and 5.

**Solution:**

Divide the given numbers with least common prime number.

Keep dividing until all numbers are fully divided and remainder is 1.

Here, we multiply the all divisors to calculate the LCM.

Therefore, LCM(4, 5) = 20.
**Example 2:** Find the LCM of 8 and 12.

**Solution:**

Divide the given numbers with least common prime number.

Keep dividing until all numbers are fully divided and remainder is 1.

Here, we multiply the all divisors to calculate the LCM.

Therefore, LCM(8, 12) = 24.
**Example 3:** Find the LCM of 12 and 15.

**Solution:**

Divide the given numbers with least common prime number.

Keep dividing until all numbers are fully divided and remainder is 1.

Here, we multiply the all divisors to calculate the LCM.

Therefore, LCM(12, 15) = 60.

### Exercise

**1.** LCM(12,18) = 36

**2.** LCM(20,36) = 180

**3.** LCM(28,35) = 140

**4.** LCM(24,36) = 72

**5.** LCM(30,45) = 90

**6.** LCM(6,15) = 30

**7.** LCM(20,80) = 80

**8.** LCM(15,4) = 60

**9.** LCM(22,6) = 66

**10.** LCM(60,120) = 120