The Least Common Multiple (LCM) of 20 and 55 is the smallest number that both 20 and 55 divide into without leaving a remainder.

### Steps to find the LCM:
1. **Prime Factorization**:
   - \( 20 = 2^2 \times 5 \)
   - \( 55 = 5 \times 11 \)

2. **LCM Calculation**: 
   Take the highest power of each prime factor present in the factorizations.
   - From 20: \( 2^2 \) and \( 5 \)
   - From 55: \( 5 \) and \( 11 \)

   The LCM is \( 2^2 \times 5 \times 11 = 4 \times 5 \times 11 = 220 \).

Thus, the LCM of 20 and 55 is **220**.

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### Related Questions:
1. What is the LCM of 20 and 30?
2. How do you find the GCD (Greatest Common Divisor) of two numbers?
3. What is the LCM of 15, 20, and 55?
4. Can the LCM be smaller than both numbers?
5. What is the relationship between LCM and GCD?

**Tip:** The LCM of two numbers is always divisible by both numbers!

Learn how to find the Least Common Multiple (LCM) of 20 and 55 with a detailed step-by-step solution. This problem covers key concepts in number theory, including prime factorization. Suitable for students in Grades 5-7.

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