Least Common Multiple (LCM) of 21 and 37
The least common multiple (LCM) of 21 and 37 is 777.
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 37?
First, calculate the GCD of 21 and 37 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 21 ÷ 37 = 0 remainder 21 |
| 2 | 37 ÷ 21 = 1 remainder 16 |
| 3 | 21 ÷ 16 = 1 remainder 5 |
| 4 | 16 ÷ 5 = 3 remainder 1 |
| 5 | 5 ÷ 1 = 5 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 161 and 38 | 6118 |
| 120 and 63 | 2520 |
| 104 and 126 | 6552 |
| 168 and 52 | 2184 |
| 135 and 27 | 135 |