What are factors?

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

Can you think of the factors for 12?

What numbers divide exactly into 12?

1, 2, 3, 4, 6 and 12

Can you think of the factors for 10?

What numbers divide exactly into 10?

1, 2, 5 and 10

Are you ready for the challenge?

Problem Solving:Combination Locks

Problem Solving:Combination Locks

• No!• Read all the clues• Decide which clue

is the most helpful• Work out what all the

numbers could be

1 2 3 4 5 6 7 8 9 0

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

• 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

• 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

Problem Solving:Combination Locks

How did you do?

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

Problem Solving:Combination Locks

How did you do?