Factors & Multiples, GCD & LCM · 9 lessons

Once you can divide, one question follows immediately: which divisions come out exactly? Everything in this topic is an answer to that question, from sorting counters into equal rows to a proof that the primes never run out.

1. 1Factors
2. 2Factor Pairs
3. Double and Halve
4. Multiply by 25
5. Divide by 25
6. 3Multiples
7. 4Common Factors
8. 5The Highest Common Factor
9. 6Common Multiples
10. 7The Lowest Common Multiple
11. 8Choosing Between HCF and LCM
12. 9HCF and LCM Word Problems
13. HCF and LCM (20)