Skip navigation

Profile Of : Barrie Galpin


Barrie Galpin

United Kingdom

DEMO Description

Proin faucibus arcu quis ante. Mauris sollicitudin fermentum libero. Maecenas vestibulum mollis diam. Fusce fermentum. Donec posuere vulputate arcu.

Mauris sollicitudin fermentum libero. Vivamus euismod mauris. Etiam feugiat lorem non metus. Nam commodo suscipit quam. Nullam accumsan lorem in dui.

Angle Theorems

Traditional angle theorems explored in a far from traditional way!

Author: Barrie Galpin

Tags: Algebra

Shoe Sizes with Box Plots

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

Author: Barrie Galpin

Tags: Data, Box plots, Time series


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

Author: Barrie Galpin

Tags: Circumference


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

Author: Barrie Galpin

Tags: Patterns, STEM, Chemistry

Ice and Salt

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

Author: Barrie Galpin

Tags: Physics

Air Resistance

Motion data from weighted cones shows air resistance varies as the square of terminal speed

Author: Barrie Galpin

Tags: Physics

Exploring our Solar System

Detailed data for the properties of the planets with 10 pages of questions.

Author: Barrie Galpin

Tags: Data, STEM, Physics

Premier League Goals

Compare frequencies of goals scored per team per match and resulting scorelines.

Author: Barrie Galpin

Tags: Data, Frequency, Sport, Probability

Centres of a Triangle

Construct some of the centres of a triangle and investigate relationships between them, discovering the Euler Line

Author: Barrie Galpin

Tags: Circles, Zeros, Geometry, T3

Averages with dice

Simulate the throws of one or more dice, predict and tabulate outcomes. Plot the data and obtain averages and the range.

Author: Barrie Galpin

Tags: Averages, Expected frequency, Randomness, Probability

Circle Theorems

Explore five circle theorems by moving lines and points around the TI-Nspire screen.

Author: Barrie Galpin

Tags: Temperature


Experience reflection dynamically: relationships between the object, the image and the position and orientation of the mirror.

Author: Barrie Galpin

Tags: Reflection

Relative Frequency

Animation comparing absolute and relative frequencies for simulated dice throws and coin tosses

Author: Barrie Galpin

Tags: Frequency, Probability

Power and Exponential Laws

Modelling situations where experimental data suggests there may be either power or exponential functions

Author: Barrie Galpin

Tags: Exponential, Powers and roots, Scattergraphs, Logarithms, Modelling

Straight-line Graphs

Introducing the connection between linear equations and straight-line graphs

Author: Barrie Galpin

Tags: Linear, Patterns, Functions

Similar Shapes

A dynamic approach to enlargement and similarity

Author: Barrie Galpin

Triangle construction

When constructing triangles, why is there only one possibility?

Author: Barrie Galpin

Tags: Fractions

Crop Circles

Geometrical constructions and patterns in the context of crop circles

Author: Barrie Galpin

Tags: Polygons, Triangle, Symmetry

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