Perpendicular lines on a graph ... are one of those questions that come up fairly infrequently, although it can be an easy few marks if you remember how to plot them. Parallel lines tend to be more popular so I've included both types of questions in the videos below. Top Tips! ● Draw accurately and use a table to work out the points you need ● Parallel lines have the same … [Read more...]

## Surds – ‘show that’ and ‘write in the form’ questions – mid-level

Surds ... are becoming more popular with GCSE maths questions although, rather than calculating, you'll be expected to leave the answer in a 'surd form.' This usually means leaving as a square root, which cannot be reduced to a whole number. They are much more accurate than trying to calculate with decimals, although it's quite difficult to give precise answers to the … [Read more...]

## Box plots – mid-level GCSE mathematics

Here’s a few videos on how to draw box plots, sometimes called box and whisker diagrams. They are fairly popular on GCSE mathematics although occasionally you'll be asked to compare them with cumulative frequency diagrams. Both CF and box plots give the same time of information - median, upper / lower quartiles and range. questions where Top Tips! ● Box plots are just … [Read more...]

## Cumulative frequency diagrams – GCSE mathematics mid-level

Cumulative frequency diagrams are quite popular on GCSE mathematics papers. They can be fairly straightforward, although it'll be useful to also practice box plots. The information is fairly similar ... you can find the median, quartiles and ranges in both, with a typical question comparing information from both sources. Q4 on these past paper questions might be useful to … [Read more...]

## How to work with scale factors – mathematically similar shapes

Here's a few videos on how to work with scale factors, that I hope might be useful. They are becoming a little more popular on GCSE mathematics as you need to demonstrate a clear, logical method. However the questions can a be a little tricky: You need to remember that the scale factor is usually calculated as a linear measurement Once you have calculated the scale factor … [Read more...]