Maths questions often start with the command words 'calculate' or 'determine'. They will then have a blank space for you to show your working. It is important that you show your working - don't just write the answer down. You might earn marks for your working even if you get the answer incorrect.
In some maths questions you will be required to give the units. This may earn you an additional mark. Don't forget to check whether you need to do this.
Maths questions might include graphs and tables as well as calculations. Don't forget to take a ruler and calculator.
If drawing graphs, make sure you:
If you are asked to calculate an answer and it has lots of decimal places, don't forget to use the same number of significant figures as the data in the question. For example, if two significant figures are used in the question, then usually your answer would also be to two significant figures. Don't forget to check your rounding.
A student observed a cell with a microscope. The magnification of the eyepiece was x10. The magnification of the objective was x20.
a) What magnification was the student using? [1 mark]
The student measured a cell they were looking at as 0.5 mm.
b) Convert the cell measurement into micrometres. [1 mark]
This question has been written by a Bitesize consultant as a suggestion to the type of questions that may appear in an exam paper.
a) x200 
The x10 magnification of the eyepiece lens should be multiplied by the x20 of the objective lens. 10 × 20 = x200.
b) 500 μm 
1 millimetre = 1000 μm, so 0.5mm × 1000 = 500 μm.
Students investigated the activity of the enzyme lipase in milk at different temperatures.
The results of the investigation are shown below:
|Temperature (°C)||Enzyme activity (a.u.)|
a) Plot the results on a grid where the x axis is 'Temperature in °C' and the y axis is 'Enzyme activity (a.u.)'. You must also:
b) From your graph:
i) Describe how the activity of the enzyme changes between the temperatures of 25°C and 45°C [1 mark]
ii) Calculate the change in enzyme activity between 15°C and 35°C. Show your working [2 marks]
Question courtesy of Eduqas.
b) i) Rises then falls/goes up and then goes down/goes to maximum and then drops. 
ii) Correct readings from graph should be shown in working:
= 51 - 23 
= 28 
The examiner will accept the answer 27.5 or 27 if the readings taken from the graph are slightly different.
An experiment was set up to investigate the digestion of fat in milk by the enzyme lipase. A beaker containing milk and lipase was kept at a constant temperature in a water bath. The pH readout on the laptop was recorded every 5 minutes for 40 minutes. The results are shown below.
The average rate of fall in pH in the first 20 minutes is 0.025 pH units per minute. After 20 minutes bile was added to the beaker. Calculate the average rate of fall in pH units per minute in the 20 minutes after the bile was added. [1 mark]
______ pH units per minute.
Question courtesy of Eduqas.
0.135  pH units per minute