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Profile Of : Barrie Galpin


Barrie Galpin

United Kingdom

DEMO Description

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Angle Theorems

Traditional angle theorems explored in a far from traditional way!

Author: Barrie Galpin

Tags: Algebra

City Data

Data from 50 cities around the world - all ready to be explored and analysed

Author: Barrie Galpin

Topic:  Mathematics

Tags: Decimals, Data, Differentiation

Trig Symmetry

A tool to demonstrate that parts of the trig function curves are essentially the same.

Author: Barrie Galpin

Topic:  Mathematics

Tags: Trigonometry

Turn, turn, turn, turn

UPDATED. Four rotations of 90° and you get back to where you started .... always?

Author: Barrie Galpin

Topic:  Mathematics

Tags: Transformations

Time of Death

Collect temperature data and use an exponential model to estimate time of death.

Author: Barrie Galpin

Topic:  Mathematics

Tags: Physics

Hurricane force

Investigate data from weather stations including wind speeds in different units

Author: Barrie Galpin

Topic:  Mathematics

Tags: Environment, Exponential, Measures, STEM

GB Olympic Medals

UPDATED. How many Olympic medals will Team GB win in Rio 2016?

Author: Barrie Galpin

Topic:  Mathematics

Tags: Data, Sport

Olympic Cycling

Four problem-solving activities on the theme of track cycling.

Author: Barrie Galpin

Topic:  Mathematics

Tags: Data, Tables, Sport, Geometry

STEM calculator guide

A guide to using the handheld to perform calculations typically done in Science, Technology, Engineering and Maths. (Revised for v3.2.)

Author: Barrie Galpin

Topic:  Mathematics

Tags: STEM, Standard form, Notation

Adding Fractions

Innovative way to explore fraction concepts, particularly equivalence and addition.

Author: Barrie Galpin

Topic:  Mathematics

Tags: Fractions, Similarity

Compare the weather

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

Author: Barrie Galpin

How many squares?

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

Author: Barrie Galpin

Tags: Circles, Mathematical thinking


An introduction to the use of coordinates for younger students

Author: Barrie Galpin

Tags: Coordinate systems

Dissecting squares

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

Author: Barrie Galpin

Tags: Fractions, Scattergraphs, Algebra, Geometry

Temperature Conversions

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

Author: Barrie Galpin

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


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

Author: Barrie Galpin

Tags: Angles, Triangle

Connecting Algebra, Geometry and Graphs

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

Author: Barrie Galpin

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

The Warehouse Problem

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

Author: Barrie Galpin

Tags: Modelling

Intersecting Tangents of a Parabola

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

Author: Barrie Galpin

Tags: Quadratic, Simultaneous equations, Reasoning, Coordinate Geometry

Circle Angles

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

Author: Barrie Galpin

Tags: Angles, Circle theorems