Least Common Multiple (LCM) of 72 and 172
The least common multiple (LCM) of 72 and 172 is 3096.
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 72 and 172?
First, calculate the GCD of 72 and 172 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 72 ÷ 172 = 0 remainder 72 |
| 2 | 172 ÷ 72 = 2 remainder 28 |
| 3 | 72 ÷ 28 = 2 remainder 16 |
| 4 | 28 ÷ 16 = 1 remainder 12 |
| 5 | 16 ÷ 12 = 1 remainder 4 |
| 6 | 12 ÷ 4 = 3 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 19 and 75 | 1425 |
| 192 and 192 | 192 |
| 135 and 48 | 2160 |
| 128 and 129 | 16512 |
| 25 and 55 | 275 |