5. What methods did you use to solve the problem?
Was there a particular number you started with? Why?

6. LO: TBAT find the highest common factor of numbers
Title: Highest Common Factor
Key Words
Factor - all the numbers that divide exactly into an integer without leaving a remainder
Highest Common Factor - The highest factor that goes into more than one number
Integer - whole number

7. Example Your Turn Find the highest common factor of 10 and 15

8. Your Turn

9. Challenge Question
The HCF of two numbers is 16. The smaller of the two numbers is 64 less than the larger. Both numbers are less than 100. Work out what the two numbers could be.
80 and 16

10. Mr Wrong
Mr Wrong thought that the highest common factor of 18 and 36 is 6.
What is the highest common factor of 18 and 36?
What did Mr Wrong do wrong?