Least Common Multiple (LCM) of 56 and 21
The least common multiple (LCM) of 56 and 21 is 168.
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 56 and 21?
First, calculate the GCD of 56 and 21 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 56 ÷ 21 = 2 remainder 14 |
| 2 | 21 ÷ 14 = 1 remainder 7 |
| 3 | 14 ÷ 7 = 2 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 127 and 61 | 7747 |
| 43 and 33 | 1419 |
| 129 and 150 | 6450 |
| 43 and 15 | 645 |
| 124 and 66 | 4092 |