If you work with integer numbers then is a good idea to know how to factorize them into prime factors, calculate their greatest common factor and least common multiple, check on numbers divisibility and also find all divisors of a number and much more. One example where you can apply all the above described knowledge is when you have to reduce fractions to lower terms (simplify them). numere-prime.ro website comes in handy and can easily help you with all the operations described above, and also with explanations, where the case. An alternative practical way to compute the greatest common divisor and the least common multiple for large numbers is also presented on the website: the Euclidean algorithm. And if you also need to find without much calculation the prime numbers in a list of ascending sorted numbers, you can use the Sieve of Eratosthenes - by this method you eliminate all the multiples of all prime numbers, from a list, up to a given limit, starting with the smallest, 2, 3, 5, 7, ... and so on. This website can help users a lot with their math lessons. Users can set the preferred language of the content to either English, German, Spanish, French, Italian or Romanian.