Least Common Multiple (LCM) of 21 and 156
The least common multiple (LCM) of 21 and 156 is 1092.
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 156?
First, calculate the GCD of 21 and 156 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 21 ÷ 156 = 0 remainder 21 |
| 2 | 156 ÷ 21 = 7 remainder 9 |
| 3 | 21 ÷ 9 = 2 remainder 3 |
| 4 | 9 ÷ 3 = 3 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 135 and 65 | 1755 |
| 49 and 19 | 931 |
| 183 and 179 | 32757 |
| 144 and 133 | 19152 |
| 112 and 76 | 2128 |