These resources have been reviewed and selected by STEM Learning’s team of education specialists for factual accuracy and relevance to teaching STEM subjects in UK schools.


These 15 instant maths ideas, ideal for use as starter questions, extension question or probing questions to assess understanding, require students to perform a practical experiment in order to estimate a value for pi, describe a circle over the phone, find a connection between the length of the radius of a circle and the area of the circle, explore different series giving approximations for pi, investigate problems requiring the calculation of circumference and calculate the number of revolutions per minute of a spinning object. The student resource sheets require students to use flow diagrams to calculate areas and perimeters of circles and estimate the area of circles drawn on squared paper.

Show health and safety information

Please be aware that resources have been published on the website in the form that they were originally supplied. This means that procedures reflect general practice and standards applicable at the time resources were produced and cannot be assumed to be acceptable today. Website users are fully responsible for ensuring that any activity, including practical work, which they carry out is in accordance with current regulations related to health and safety and that an appropriate risk assessment has been carried out.


Show downloads

Information on the creators and permitted use of this resource is covered by the Category Three Materials - Community Resources section in STEM Learning’s Terms and conditions

Lists that tag this content