Don't forget to take a ruler and calculator into the exam. Maths questions often start with the command word calculate. You need to use numbers given in the question to work out the answer. When an ...

This video shows how to make the Blue Bottle Reaction, where a clear liquid turns bright blue when shaken, then fades as it sits still. The secret? It’s all about how oxygen reacts with the dye in the ...

A number machine is a way of writing rules using a flow diagram. The equation \(3j - 6 = 9\) can be shown on a number machine by writing out the functions that have been applied to \(j\) in the order ...