✓ Effortless Math · Free Tool

Modular Arithmetic Calculator

Compute a mod m, modular addition, subtraction, multiplication, exponentiation, and the modular inverse — with clear step-by-step working.

Modular inverse:  find x with  a · x ≡ 1 (mod m)
a b modulus m

Enter whole numbers. The modulus m must be a positive integer.

Results

Result
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Expression
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Quotient / detail
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gcd(a, m)
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Check
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Step-by-step