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Math calculators and tools

Convert number systems, simplify ratios, test primes and calculate grades with transparent methods.

Convert batches between binary, decimal, hexadecimal and octal, including signed bit widths.

Simplify ratios, scale quantities or solve a missing proportion with exact integer reduction.

Check integers with deterministic primality testing and bounded factorization.

Calculate weighted or points-based grades and find a required final-exam score.