How to use sin, cos and tan continues... .. with a video on finding the missing length in a right angle triangle. Watch the video and try the quick test. Click here to try the Quick Test SohCahToa As before you can use SOHCAHTOA to calculate, although, in this case, you'll need to: know the length of one side know the size of one of the acute angles A typical exam … [Read more...]
How to work with probability tree diagrams
Probability tree diagrams are just a picture.. .. that show all the possible outcomes from a series of events. They can be quite useful as probability needs some careful thought. Watch the video and download the quick test - good luck! This video deals with a GCSE question: There are 3 strawberry yoghurts and 4 peach yoghurts in a fridge. Kate takes a yoghurt at random … [Read more...]
How to solve linear equations with video examples
How to solve linear equations .. some of them you'll solve without really thinking about! Suppose you bought a CD for £8 and then two books at the same price. The total cost is £25 and, with a little bit of arithmetic, you might work out the price of each book is £8.50. Mathematicians like to call these "linear equations" and they look something like: 2B + 8 = 25 (where 'B' … [Read more...]
How to work with arithmetic sequences
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 prime factors of a number
Did you know that any number is either a prime number; or can be made by multiplying its unique prime factors together? So: [table id=4 /] This is called 'the fundamental theory of arithmetic' and prime factors are very important in lots of different applications. The most well known is called RSA encryption, named after the 3 creators, Rivest, Shamir, and Adelman. They … [Read more...]