# Security Cameras

**Lesson Plan:** A problem-solving activity about optimisation involving the construction and calculation of areas and the comparison of percentages.

Subject: | Mathematics. |
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Age of students: | 11-14 years. |

Hardware: | Tablets (iPad 1 per class or student). |

Software: | Socrative or Classflow Apple airserver OR Showme and Reflector OR Plickers. |

Functionalities of Technology: | Sending and displaying Processing and analysing. |

Time needed: | 2-3 hours. |

FaSMEd partner: | University of Newcastle Upon Tyne. |

**Summary:**

This lesson unit is intended to help you assess how well students are able to:

- Analyse a realistic situation mathematically.
- Construct sight lines to decide which areas of a room are visible or hidden from a camera.
- Find and compare areas of triangles and quadrilaterals.
- Calculate and compare percentages and/or fractions of areas.

**Resources:
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**Note:**

This tool describes ways in which digital technology can be used to support formative assessment. The original materials (pen-and-paper) were designed by the Mathematics Assessment Project and can be found under the link above.