Least Common Multiple (LCM) of 20 and 123
The least common multiple (LCM) of 20 and 123 is 2460.
What is the Least Common Multiple (LCM)?
The LCM of two integers is the smallest positive integer that is divisible by both numbers. It is often used to find common denominators and solve problems involving periodic events.
Formula for LCM
The LCM of two numbers can be calculated using their GCD:
LCM(a, b) = |a × b| ÷ GCD(a, b)
How to Calculate the LCM of 20 and 123?
First, calculate the GCD of 20 and 123 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 20 ÷ 123 = 0 remainder 20 |
| 2 | 123 ÷ 20 = 6 remainder 3 |
| 3 | 20 ÷ 3 = 6 remainder 2 |
| 4 | 3 ÷ 2 = 1 remainder 1 |
| 5 | 2 ÷ 1 = 2 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 183 and 156 | 9516 |
| 169 and 108 | 18252 |
| 34 and 121 | 4114 |
| 119 and 136 | 952 |
| 167 and 137 | 22879 |