The common factors of 12 and 30 is 1,2,3 and 6!

Learning Intention: We are learning to develop our number knowledge. 
Success Criteria: I know I can do this when I explain that a common factor is when you find out the factors of two numbers and work out the numbers that appear in both lists. 

Did you know that the common factors of 12 and 30 are 1, 2, 3 and 6?

Learning intention: We are learning to understand common factors.
Success criteria: I know I can do this when I write down the common factors of 12 and 30.