Factors, multiples, and primes
Find all factor pairs of a number and list its multiples. Recognise prime and composite numbers — at an introductory level.
Available exercises
Divisibility rules
Decide whether a number is divisible by 2, 3, 4, 5, 6, 9 or 10 — using divisibility rules.
Greatest common factor (GCF)
Find the largest number that divides both given numbers.
Least common multiple (LCM)
Find the smallest number that is a multiple of both given numbers.
Prime factorisation
Write a number as a product of prime numbers.