Lcm 4 5 E0Fb95

1. **State the problem:** We need to find the least common multiple (LCM) of the numbers $4$ and $5$. 2. **Recall the formula for LCM:** The LCM of two numbers $a$ and $b$ can be found using the formula: $$\text{LCM}(a,b) = \frac{|a \times b|}{\text{GCD}(a,b)}$$ where GCD is the greatest common divisor. 3. **Find the GCD of $4$ and $5$:** Since $4$ and $5$ have no common factors other than $1$, $$\text{GCD}(4,5) = 1$$ 4. **Calculate the LCM:** $$\text{LCM}(4,5) = \frac{4 \times 5}{1} = 20$$ 5. **Conclusion:** The least common multiple of $4$ and $5$ is $20$. So among options A, B, C, D, the correct one is the option representing $20$.