Least Common Multiple (LCM) of 21 and 56
The least common multiple (LCM) of 21 and 56 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 21 and 56?
First, calculate the GCD of 21 and 56 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 21 ÷ 56 = 0 remainder 21 |
| 2 | 56 ÷ 21 = 2 remainder 14 |
| 3 | 21 ÷ 14 = 1 remainder 7 |
| 4 | 14 ÷ 7 = 2 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 43 and 63 | 2709 |
| 118 and 123 | 14514 |
| 43 and 131 | 5633 |
| 73 and 88 | 6424 |
| 23 and 171 | 3933 |