Least Common Multiple (LCM) of 100 and 21
The least common multiple (LCM) of 100 and 21 is 2100.
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 100 and 21?
First, calculate the GCD of 100 and 21 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 100 ÷ 21 = 4 remainder 16 |
| 2 | 21 ÷ 16 = 1 remainder 5 |
| 3 | 16 ÷ 5 = 3 remainder 1 |
| 4 | 5 ÷ 1 = 5 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 154 and 27 | 4158 |
| 98 and 58 | 2842 |
| 172 and 89 | 15308 |
| 115 and 56 | 6440 |
| 32 and 158 | 2528 |