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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. Skip to: 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

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. Skip to: 00:00 Introduction 00:19 What are upper and lower bounds 01:02 Degree of accuracy 01:40 Examples 02:35 Practice questions

This video explains what the multiples and factors of a number are. Practice questions are at the end of the video.

This video will explain the four types of triangles and their properties: right-angled, equilateral, isosceles and scalene triangles. Practice questions are at the end of the video.

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

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.

This video will show you how to find the volume of a cuboid. Practice questions and answers are at the end of the video.

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.

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

This video explains how to draw 2D projections of 3D shapes: plans, front elevations and side elevations. Practice questions are at the end of the video.

This video explains 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. For a refresher on multiples: https://youtu.be/pEy8QKEBL_M For a refresher on prime factors: https://youtu.be/Bphq-n84ouM Skip to: 00:00 Intro 00:27 What does lowest common multiple mean 01:00 Method 1: Listing the multiples 01:29 Method 2: Using prime factorisation 01:54 Example 02:13 Practice questions and answers

In this video we explain the different types of angles in maths. We explain acute angles, right angles, straight angles, obtuse angles, reflex angles and full rotations. Two sets of practice questions and answers are at the end of the video so you can test your knowledge. Skip to: 00:00 Introduction 00:21 What are angles and what symbols are used? 01:01 Actue angles 01:30 Right angles 01:42 Obtuse angles 01:52 Straight angles 02:02 Reflex angles 02:14 Full rotation 02:24 Practice questions set 1 02:50 Practice questions set 2

In this video we explain what a reciprocal of a number is and what a reciprocal of a reciprocal is. Practice questions and answers at the end of the video. Skip to: 00:00 Introduction 00:20What is a reciprocal of a number? 01:10 Reciprocal of the number 3 example 01:54 More reciprocal examples - do you notice a pattern? 02:28 Reciprocal of a number: definition 02:36 What is the reciprocal of a quarter? 03:02 Practice questions and answers

This video provides some typical GCSE exam style practice questions on the topic of nets of 3D shapes. We also explain how the marks are awarded for each question. For a recap on nets of 3D shapes see our video: https://youtu.be/s7GrS0b3FRw For a recap on compound shapes: https://youtu.be/U25OYoLYtVM Skip to: 00:00 Introduction 00:25 GCSE style question one 01:56 GCSE style question two 03:15 GCSE style question three

More Pentominoes Puzzles! This video follows on from our previous video and provides four advanced pentominoes puzzles and solutions. A great activity to develop your problem solving skills! Check out our introduction to pentominoes video: https://youtu.be/9NnVtP6GAiI To complete the puzzles either use squared paper and colouring pencils or use this virtual manipulative: https://mathsbot.com/manipulatives/pentominoes Skip to: 00:00 Introduction 00:23 Example pentominoes puzzle 00:57 Pentominoes puzzle 1: 8 x 8 grid 01:23 Pentominoes puzzle 2: 9 x 9 grid 01:48 Pentominoes puzzle 3: 8 x 8 grid 02:12 Pentominoes puzzle 4: 3 x 15 grid

This video will explain what place value is and the different place value headings from units to thousands. Practice questions and answers are at the end of the video. (Decimals and beyond thousands will be explained in another video).

This video walks you through some GCSE exam style practice questions on the topic of 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.

This video explains some of the most common symbols used in mathematics, their names and their meanings.

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.