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Both calculators run independently — change the inputs on either side to compare results.

Modulo Calculator

Compute a mod b — the remainder when dividend a is divided by divisor b. Foundational for clock arithmetic, cyclic patterns, hashing, parity tests, modular arithmetic in cryptography, and any "wrap-around" computation.

Dividend

Divisor

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Math

Greatest Common Factor Calculator

Find the greatest common factor (GCF) — also called the greatest common divisor (GCD) — of two integers using the Euclidean algorithm. The largest number that divides both inputs evenly; used everywhere from simplifying fractions to designing tilings to cryptography.

First Number

Second Number

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Key differences

	Modulo Calculator	Greatest Common Factor Calculator
Category	Math	Math
Inputs required	2	2
Result	Remainder	Greatest Common Factor
What it does	Compute a mod b — the remainder when dividend a is divided by divisor b. Foundational for clock arithmetic, cyclic patterns, hashing, parity tests, modular arithmetic in cryptography, and any "wrap-around" computation.	Find the greatest common factor (GCF) — also called the greatest common divisor (GCD) — of two integers using the Euclidean algorithm. The largest number that divides both inputs evenly; used everywhere from simplifying fractions to designing tilings to cryptography.