Find the least common multiple or greatest common factor of 2 to 15 positive whole numbers. Choose a mode, enter each number, and see the exact result with steps locally in your browser.
Enter each value in its own structured field instead of typing a comma-separated list. Use LCM for the smallest shared total or when repeating cycles meet, and use GCF for the largest equal group size that divides every input. GCF is also called GCD or HCF.
This first release accepts 2 to 15 positive whole numbers with at most 18 digits each. It excludes zero, negative values, decimals, fractions, variables, and polynomials. Exact results are limited to 200 digits, and prime factors are shown only when every input is at most 1,000,000,000. Inputs, results, factors, and steps stay in the browser and are excluded from analytics and masked in session replay.
LCM is the smallest positive whole number divisible by every input, so it is useful for shared totals or repeating cycles. GCF is the largest positive whole number that divides every input, so it is useful for forming the largest equal groups.
Yes. For positive whole numbers, greatest common factor, greatest common divisor, and highest common factor name the same value. Different regions and teaching materials prefer different terms.
Yes. The calculator starts with two structured fields and lets you add inputs one at a time up to a maximum of 15. The displayed work reduces the values pair by pair in input order.
Broader mathematical definitions can use conventions for zero and negative inputs. This first release intentionally accepts positive whole numbers only so its LCM, GCF, validation, and displayed steps remain consistent.
Divide the larger number by the smaller number, then repeat with the divisor and remainder. When the remainder becomes zero, the last nonzero divisor is the GCF.
No. The calculation runs locally in your browser and does not save answer history. Source values, exact results, prime factors, and steps are excluded from analytics and masked in session replay.