el mcd (320; 1; 120) = 1

prime numbers. composite numbers. check on whether a number is prime or not. composite numbers prime factorization. the greatest (highest) common factor (divisor), gcf (hcf, gcd). the least common multiple, lcm. fractions completely reducing (simplifying) to the lowest terms (the simplest form, the smallest possible numerator and denominator). numbers divisibility: tell and explain whether a number is divisible by another or not. all the (common) factors (divisors) of one or two numbers (proper, improper and prime factors). coprime numbers (relatively prime, prime to each other). numbers parity: even or odd numbers?