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Mathematics
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Maths Puzzles With Answers
This video contains four maths puzzles with answers. These maths puzzles are great for brain training and for lesson starters.
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Triangular Numbers Explained
This video explains what triangular numbers are and the patterns associated with them. Two puzzles are at the end of the video.
Skip to:
00:00 Introduction
00:22 What exactly is a triangular number?
00:42 What patterns do you notice about the sequence?
01:43 How to find a triangular number
02:20 Practice questions/ puzzles
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Video: Types Of Triangles And Their Properties
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.
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Video: Drawing on isometric paper
In this video we show you how to draw 3D shapes on isometric paper. There are practice questions at the end of the video. You can download some isometric paper from here: https://nrich.maths.org/isometricpaper
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Projections: Plans and Elevations in Maths
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.
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Adding and Subtracting Negative and Positive Numbers
In this video we will explain how to add and subtract negative and positive numbers. We also explain why subtracting a negative number results in addition etc and demonstrate these using real world examples as well as on a number line.
This is a link to our YouTube video which you can use during your maths lessons.
Skip to:
0:45 Adding a positive number
1:46 Subtracting a negative number
2:46 Subtracting a positive number
3:34 Adding a negative number
4:17 Summary of sign rules
4:32 Practice questions
We provide free educational maths help videos to learn mathematics for school, exams revision etc. We add new videos to our channel weekly.
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Interior and Exterior Angles of a Polygon: Video
This video explains how to calculate interior and exterior angles of a polygon.
It also explains how we find the the sum of interior or exterior angles and how to find the number of sides with just an angle provided.
Practice questions are provided at the end of the video.
This is a link to our YouTube video which you can use during your maths lessons.
We provide free educational maths help videos to learn mathematics for school, exams revision etc. We add new videos to our channel weekly.
![minitymaths](https://d2w4qhtqw2dbsq.cloudfront.net/profile_live/28743863/small.jpg)
Algebra: Collecting Like Terms & Simplifying
This video will cover collecting like terms and simplifying algebraic expressions. We explain what a “like term” is and how to then collect these terms together to simplifying an expression. We will then explain how to write the expression in its simplest form.
Practice questions are provided at the end of the video.
This is a link to our YouTube video which you can use during your maths lessons.
We provide free educational maths help videos to learn mathematics for school, exams revision etc. We add new videos to our channel weekly.
![minitymaths](https://d2w4qhtqw2dbsq.cloudfront.net/profile_live/28743863/small.jpg)
Polygons Video: 2D Shape Properties
This video provides an introduction to Polygons and their properties. Students learn the difference between regular & irregular polygons and the names of these 2D shapes such as pentagon and hexagon.
Practice questions are provided at the end of the video.
This is a link to our YouTube video which you can use during your maths lessons.
We provide free educational maths help videos to learn mathematics for school, exams revision etc. We add new videos to our channel weekly.
![minitymaths](https://d2w4qhtqw2dbsq.cloudfront.net/profile_live/28743863/small.jpg)
Finding Percentages of Amounts: Video
This video explains two easy methods to calculate percentages of amounts.
First method: change percentage to a decimal.
Second method: find one percent first.
Practice questions are provided at the end of the video.
This is a link to our YouTube video which you can use during your maths lessons.
We provide free educational maths help videos to learn mathematics for school, exams revision etc. We add new videos to our channel weekly.
![minitymaths](https://d2w4qhtqw2dbsq.cloudfront.net/profile_live/28743863/small.jpg)
Tessellations Explained: Geometry Video
This video explains and demonstrates what tessellation means and how to calculate if a shape will tessellate.
This is a link to our YouTube video which you can use during your maths lessons.
We provide free educational maths help videos to learn mathematics for school, exams revision etc. We add new videos to our channel weekly.
![minitymaths](https://d2w4qhtqw2dbsq.cloudfront.net/profile_live/28743863/small.jpg)
Name The Parts Of A Circle | Geometry Video
This video is a link to an animated video covering how to name the parts of a circle such as the arc, segment and chord. Practice questions are at the end of the video asking students to match descriptions to the names, followed by labelling the parts of a circle.
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Why Do We Use Letters In Algebra
This is a gentle introduction to algebra and is a great activity to introduce the concept of using letters to represent unknown values. To demonstrate this we use shapes in place of letters and ask learners to find the missing number. Practice questions are provided at the end of the video.
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Angles in Parallel Lines
This is a link to our YouTube video which explains the rules for an angle formed by a transversal (line) crossing a pair of parallel lines: corresponding angles, alternate angles, corresponding angles and allied angles. Practice questions are at the end of the video.
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Bearings in Maths
Link to YouTube video: This video will explain what bearings are in maths and how to calculate them. A practice question is provided at the end of the video.
Below are some useful videos to watch prior to this:
Angles in parallel lines: https://youtu.be/5vgv3gLPXog
Basic angle facts: https://youtu.be/uIOHgLmrVmY
Skip to:
00:00 What is a bearing & examples
01:12 Example one: finding a bearing from a given point
02:29 Example two: finding a bearing when given another bearing
03:34 Example three: finding a point when given two bearings
04:33 Practice question and answer
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Multiplying Decimals Without A Calculator
This video explains how to multiply decimal numbers without using a calculator. We explain two different ways to do this; remove the decimal points (this can be used with grid, line and column multiplication methods) or by keeping the decimal points in place for the lattice method.
Practice questions are at the end of the video.
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Video: Rotational Symmetry
This video explains what rotational symmetry is and how to find the order of rotational symmetry of a shape. Practice questions and answers are at the end of the video.
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What Is A Fraction
This video explains what a fraction is, how to write a fraction and the different types of fractions. We also explain what numerator and denominator means. Practice questions and answers are at the end of the video.
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Multiplying and Dividing Two Fractions
This video explains how to multiply two fractions together and how to divide one fraction by another fraction. Practice questions are given at the end of the video.
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How To Find The Perimeter
This video explains how to find the perimeter of 2D shapes such as squares, rectangles, triangles and composite shapes. A range of practice questions are at the end of the video.