This video deals with how to work with arithmetic sequences with a 'common difference.' This is where the same number is added, or subtracted, each time. For instance the sequence 12, 16, 20, 24, 28 .... has a common difference of add 4 ...... or 16, 8, 0, -8, -16 has a common difference of subtract 8. How to work out arithmetic sequences and value of nth term. GCSE grade C … [Read more...]
How to work out the HCF and LCM using factor trees
Factor trees are useful way of showing numbers that divide into the larger number. They're basically a picture with the number at the top and its factors below. So, if we look at the number 42, a typical factor tree could look like either one of these: Notice that the second line in both trees are different. These are still factors of 42 but, if you follow it through to the … [Read more...]