1. What are factors?

2. Factors are numbers that divide EXACTLY into other numbers without a remainder

3. Can you think of the factors for 12? What numbers divide exactly into 12? 1, 2, 3, 4, 6 and 12

4. Can you think of the factors for 10? What numbers divide exactly into 10? 1, 2, 5 and 10

5. Are you ready for the challenge? Problem Solving: Combination Locks

7. No! Read all the clues Decide which clue is the most helpful Work out what all the numbers could be 12345678901234567890

8. I can find different answers to solve a problem I can check that my answers make sense I can explain why my answer makes sense Problem Solving: Combination Locks

9. The first number is a quarter of 8 The second number is 10 take away itself The third number is double the first number The last number is the second number add 5 Problem Solving: Combination Locks

10. The last number is double the first number The second number is an odd number in the 3 times table The first number is ½ of 8 The third number is a factor of 12 Problem Solving: Combination Locks

11. How did you do?

12. What do I have to do to find the combination? Work as a group to read the problems Work in pair to solve the problems Discuss your answers in your group AGREE on a combination for the lock Try your combination! Problem Solving: Combination Locks

13. How did you do?