1. Find the definition
2. List all the prime numbers between 1 and 20. 2,3,5,7,11,13,17,19.
3. List the factors of 16. 1,2,4,16
4. List the factors of 30. 1,2,3,5,6,10,15,30.
5. List the first five multiples of 7. 7,14,21,28,35
6. List the first five multiples of 10. 10,20,30,40,50
7. What is the highest common factor (HCF) of 12 and 18. 6
8. What is the lowest common multiple (LCM) of 4 and 6. 2