Least Common Multiple (LCM) of 21 and 174
The least common multiple (LCM) of 21 and 174 is 1218.
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 174?
First, calculate the GCD of 21 and 174 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 21 ÷ 174 = 0 remainder 21 |
| 2 | 174 ÷ 21 = 8 remainder 6 |
| 3 | 21 ÷ 6 = 3 remainder 3 |
| 4 | 6 ÷ 3 = 2 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 154 and 54 | 4158 |
| 165 and 142 | 23430 |
| 17 and 169 | 2873 |
| 197 and 69 | 13593 |
| 33 and 125 | 4125 |