AMO Grade 4 · 5. Factors, multiples and divisibility
Find factors in pairs, use the divisibility tests, work with multiples and common multiples, and turn remainders into common multiples.
List all factors of a number in pairs and recognise prime numbers.
Use the divisibility tests for 2, 3, 4, 5, 9, 10, 25 and combine them correctly.
Find the greatest or smallest multiple in a range and count multiples.
Find common multiples for repeating events.
Solve remainder problems and check them with dividend = divisor × quotient + remainder.