Common Multiple Calculator

Whole numbers separated by commas or spaces, e.g. 12, 18, 24. Negative values are treated by magnitude.
Greatest common factor
2
GCF and LCM Calculator
Least common multiple
12
GCF (exact)
2
LCM (exact)
12
Numbers are coprime
No
GCF x LCM (two numbers only)
24
How many numbers
2
Worked out from Euclid, Elements, Book VII, Propositions 1-3 (the Euclidean algorithm) and 2 other sources.

How this is worked out

5 steps
  1. 4 = 2^2
  2. 6 = 2 x 3
  3. GCF = the product of every prime raised to its lowest shared power = 2.
  4. LCM = the product of every prime raised to its highest power = 12.
  5. Check: GCF x LCM = 2 x 12 = 24, which equals 4 x 6.
All common factorstable
1, 2
Prime factorizationstable
4 = 2^2, 6 = 2 x 3
numbersUsedtable
4, 6

Results are general information, not financial, tax, legal, medical or engineering advice.