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Profile Of : Barrie Galpin


Barrie Galpin

United Kingdom

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Total Resources(71)|

Angle Theorems

Author: Barrie Galpin

Tags: Algebra

Traditional angle theorems explored in a far from traditional way!

Pythagoras' Theorem

Author: Barrie Galpin

Tags: Pythagoras

Discover, confirm, illustrate and use Pythagoras' Theorem

Moveable Squares

Author: Barrie Galpin

Tags: Nets, 2D shapes, Symmetry

Move congruent squares to form nets, polyominoes and other shapes. (Ideally used with TI-Nspire Navigator)

Investigating magnetic fields

Author: Barrie Galpin

Tags: Physics

Use a voltage probe to investigate em induction when a magnet passes through a coil of wire.

Compare the weather

Author: Barrie Galpin

Use data display and statistical calculations to investigate weather data for 20 world locations with very different climates.

How many squares?

Author: Barrie Galpin

Tags: Circles, Mathematical thinking

Encourages a systematic approach when searching for solutions. (Works well with TI-Nspire Navigator)


Author: Barrie Galpin

Tags: Coordinate systems

An introduction to the use of coordinates for younger students

Dissecting squares

Author: Barrie Galpin

Tags: Fractions, Scattergraphs, Algebra, Geometry

A square is dissected to form three triangles and a quadrilateral. What fraction of the square is each part?

Temperature Conversions

Author: Barrie Galpin

Tags: Positive/negative numbers, Temperature, Use of scales, Physics

At what temperature does the number of degrees C equal the number of degrees F?


Author: Barrie Galpin

Tags: Angles, Triangle

An introduction to the angle properties of triangles and their construction.

Connecting Algebra, Geometry and Graphs

Author: Barrie Galpin

Tags: Linear, Quadratic, 2D shapes, Letters and symbols

Move from words to symbols, to geometric representations, to plotted points and finally to graphs.

The Warehouse Problem

Author: Barrie Galpin

Tags: Modelling

Where to position a warehouse in order to minimise travelling distance to the three stores it serves?

Intersecting Tangents of a Parabola

Author: Barrie Galpin

Tags: Quadratic, Simultaneous equations, Reasoning, Coordinate Geometry

Construct two tangents to a parabola and investigate the coordinates of their point of intersection.

Circle Angles

Author: Barrie Galpin

Tags: Angles, Circle theorems

Seven activities in which students investigate angles in circles using basic geometric constructions.

Volumes of Revolution

Author: Barrie Galpin

Tags: Integration

Rotate a curve about the x-axis and explore the volume of the shape generated.

The Sine Rule

Author: Barrie Galpin

Tags: Trigonometry

Investigate ratios in triangles that are not right-angled

Shoe Sizes with Box Plots

Author: Barrie Galpin

Tags: Data, Box plots, Time series

Introducing boxplots and using them to compare very large data sets.


Author: Barrie Galpin

Tags: Circumference

Explore the relationship between radius, diameter and circumference of circles.


Author: Barrie Galpin

Tags: Patterns, STEM, Chemistry

Pattern spotting in the context of the chemical formulas of the hydrocarbons

Ice and Salt

Author: Barrie Galpin

Tags: Physics

Use a temperature probe to investigate the effect of adding salt to a water/ice mixture.