Least Common Multiple (LCM) of 20 and 172
The least common multiple (LCM) of 20 and 172 is 860.
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 172?
First, calculate the GCD of 20 and 172 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 20 ÷ 172 = 0 remainder 20 |
| 2 | 172 ÷ 20 = 8 remainder 12 |
| 3 | 20 ÷ 12 = 1 remainder 8 |
| 4 | 12 ÷ 8 = 1 remainder 4 |
| 5 | 8 ÷ 4 = 2 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 159 and 17 | 2703 |
| 122 and 175 | 21350 |
| 140 and 110 | 1540 |
| 109 and 124 | 13516 |
| 87 and 181 | 15747 |