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Mathematics
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How To Find The Area Of A Trapezium
This video will explain how to find the area of a trapezium and provides a visual demonstration of the formula, using the area of a parallelogram.
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00:00 Introduction
00:17 What is a trapezium
00:43 Trapezium measurements
01:03 Visual demonstration of formula
01:56 Formula for area of a trapezium
02:06 Example
02:36 Practice questions
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Upper And Lower Bounds
This video explains how to calculate upper and lower bounds when a number has been rounded. Practice questions and answers at the end of the video.
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00:00 Introduction
00:19 What are upper and lower bounds
01:02 Degree of accuracy
01:40 Examples
02:35 Practice questions
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Video: What Are The Multiples And Factors Of A Number
This video explains what the multiples and factors of a number are. Practice questions are at the end of the video.
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Video: Semi-Regular Tessellations
This short video explains how to identify semi-regular tessellations: tessellations made up of two or more regular polygons.
Practice questions are at the end of the video.
For an explanation of regular tessellations, see our video:
https://youtu.be/PiOa_vWKJA4
Skip to:
00:00 What are semi-regular tessellations
00:34 How to identify the pattern at the vertex
01:21 Practice questions
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Video: How to find prime factors
This video explains how to find the prime factors of a number using the factor tree method. Practice questions are at the end of the video.
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Video:How to find the volume of a cuboid
This video will show you how to find the volume of a cuboid. Practice questions and answers are at the end of the video.
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Video: How to find the lowest common multiple
We explain how to find the lowest common multiple of two or more numbers, using two methods: listing the multiples and using prime factorisation. Practice questions and answers are at the end of the video.
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Video: How To Find The Highest (Greatest) Common Factor
This video explains two methods to find the highest common factor (also known as the greatest common factor) of two or more numbers: by listing the factors or by prime factorisation.
For a refresher on multiples and factors: https://youtu.be/4EkhaETrcnY
For a refresher on prime factors: https://youtu.be/1zagn5okZgM
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Scatter Graphs: What are they and how to plot them
This video explains what a scatter graph/plot is and how to plot them. A practice question is provided at the end of the video.
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00:00 Introduction
00:18 What is a scatter graph/scatter plot?
00:40 How to plot a scatter graph
01:41 Scatter graphs: practice question
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Algebra Substitution Exam Style Questions
This video walks you through some GCSE exam style practice questions on the topic of substitution in maths.
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Algebra: Substitution in Maths
This video explains substitution in maths within the topic of algebra and what it means to evaluate an expression. Practice questions are at the end of the video.
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Symbols Used In Mathematics
This video explains some of the most common symbols used in mathematics, their names and their meanings.
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Keywords in Algebra
This video goes through some important mathematical keywords in algebra. A matching activity is at the end of the video.
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How To Find The Circumference Of A Circle: Using The Diameter Or Radius
This updated video will explain how to find the circumference of a circle when given either the diameter or the radius. We also explain you how the formula is actually derived. Have a go at the practice questions at the end of the video.
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Fraction Walls: Fractions, Decimals and Percentages
This video explores the fraction wall; a visual representation of fractions. We look at three fraction walls for: fractions, decimals and percentages.
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How To Find The Area Of A Triangle
This video explains how to find the area of a triangle when we are given the lengths of the base and vertical height. We also explain why the formula works. Practice questions and answers are at the end of the video.
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Keywords In Statistics
This video explains definitions for some common keywords used in statistics. Practice questions and answers are at the end of the video.
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Quadratic Equations: Introduction / Rearranging To Standard Form
This video provides an introduction to quadratic equations; how to identify quadratic equations, how to rearrange them into the standard form, and how to identify the specific terms. A range of practice questions are at the end of the video.
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The Quadratic Formula Explained
This video explains how to solve a quadratic equation using the quadratic formula. We also explain what the discriminant is. Practice questions are at the end of the video.
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Algebra Basics: Introduction to conventions and sign rules
This video is an updated introduction lesson to the basic concepts you need to learn for algebra covering the basic conventions as well as the sign rules. Practice questions and answers at the end of the video.