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 Wednesday 4th November 2020

LC- To find common factors.


Well done for all your work on multiples. We have learned a lot!

 Today, we are moving onto factors. What is a factor?

 That's right, a factor is a number that goes into another number without a remainder. 

 So the factors of 12 are 1, 2, 3, 4, 6, 12


 This is because 12 can be divided by all of these numbers without a remainder.


  1 x 12 = 12

  2 x 6 = 12

  3 x 4 = 12


 These numbers multiplied together make 12. They are called factor pairs.


 We are going to further our learning by looking at common factors. Think what common might mean. Think back to common multiples. 


 Have a look at the following problem.



How we can find the answer to this question. What are the conditions that must be met? Can there be any ribbon left over after cutting? Can each shorter piece of the ribbon be of any length? From these conditions, what can we deduce? That's right, , the length of the shorter piece of ribbon must be a number that 156 and 132 can be divided by; could it be 11 cm, 12 cm or 13 cm? How can we find out?


Let's learn !

 So 12 is a factor of both numbers. We call this a common factor.

 If we present our work neatly and in order when we list the factors, we can find the lowest factor and the highest factor easily. 


 Try the guided practice. The later examples are more tricky but don't be out off. Once you have finished and you are confident, have a go at the Maths no problem. If you at home, do these in your home books. If you don't feel confident to move on then email your teacher.