Starter:

What is a factor?

What is a multiple?

Which is the odd number out of each list?

1. 16,32,40,52
2. 21,35, 62, 84
3. 24, 46, 84, 132
4. 18, 32, 48, 90
5. 16, 27, 54, 81

Main task:

Find the Highest Common Factor of these
numbers:

1. 18 and 30
2. 15 and 20
3. 16 and 24
4. 12 and 36
5. 20 and 30
6. 28 and 70

Find the Lowest Common Multiple of these
numbers

1. 6 and 7
2.4 and 6
3.5 and 8
4. 10 and 4
5. 16 and 5
6. 14 and 21