Least Common Multiple (LCM) of 21 and 14
The least common multiple (LCM) of 21 and 14 is 42.
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 14?
First, calculate the GCD of 21 and 14 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 21 ÷ 14 = 1 remainder 7 |
| 2 | 14 ÷ 7 = 2 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 139 and 184 | 25576 |
| 95 and 145 | 2755 |
| 53 and 53 | 53 |
| 78 and 43 | 3354 |
| 141 and 97 | 13677 |