Least Common Multiple (LCM) of 21 and 53
The least common multiple (LCM) of 21 and 53 is 1113.
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 53?
First, calculate the GCD of 21 and 53 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 21 ÷ 53 = 0 remainder 21 |
| 2 | 53 ÷ 21 = 2 remainder 11 |
| 3 | 21 ÷ 11 = 1 remainder 10 |
| 4 | 11 ÷ 10 = 1 remainder 1 |
| 5 | 10 ÷ 1 = 10 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 29 and 45 | 1305 |
| 151 and 195 | 29445 |
| 15 and 49 | 735 |
| 78 and 126 | 1638 |
| 27 and 129 | 1161 |