numere-prime.ro

numere-prime.ro offers free online calculators for operations with prime numbers, including prime factorization, greatest common factor, least common multiple, fraction reduction, divisibility, factors, coprimality and parity checks. Each calculator shows step-by-step explanations of how the result is reached. The site also includes calculators for simple math, Roman numerals, binary conversion, percentages, money, VAT and dates, along with articles on prime numbers, the Sieve of Eratosthenes and the Euclidean algorithm.

The intended users are students and other people who need quick prime number calculations or want to learn the methods behind them.

The idea grew out of a 2012 article on the haios.ro website listing prime numbers up to 200, which drew visitor interest. The site is published in eight languages (German, English, Spanish, French, Italian, Dutch, Romanian and Simplified Chinese), each on its own subdomain.

Product: Free online math calculators for prime factorization, GCF, LCM, fraction simplification and related operations, with step-by-step explanations.