How to use the rules of indices is very useful in maths .. ..as it is a convenient way of writing down large numbers that have many repeating terms. It's quicker to write 10^6 than 1,000,000 each time. The index (sometimes called the exponent) simply says how many times the number is used in the calculation. So 10³ is the same as 10 x 10 x 10 which equals 1000. This is usually … [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...]
How to expand brackets containing algebra terms
Expanding brackets containing algebraic terms. Expand and simplify meaning multiply and gather like terms. GCSE grade B / C. … [Read more...]
How to work out compound interest using a formula
A standard GCSE grade B question. Amount after n years = starting amount x (multiplier)^n. See also compound interest using a table... … [Read more...]
How to work out compound interest using a table
A standard GCSE question usually around grade C. See also compound interest using a formula... … [Read more...]