Click here to see more videos: https://alugha.com/FuseSchool
We all know what numbers are 1, 2, 3, 4, 5, etc. including negative numbers -1, -2, -3, -4, -5, etc. But did you know that mathematicians classify numbers into different types; into a number system? Let’s start at the top with real numbers. They can be positive, negative, zero, decimals, fractions, pi. Nearly any number you can think of is a real number. Only imaginary numbers, like the square root of -1 and infinity, aren’t real, but we don’t really need to worry about them at this stage. If you can put the number on a number line, then it’s a real number. This symbol is used to represent Real Numbers. Real numbers split into two subsets: rational and irrational numbers. I just remember rational fractional sound similar. So any whole number, such as terminating decimals, recurring decimals. In fact, all numbers, except for non-repeating decimals, are rational. Decimals that do not repeat are irrational. Some well-known examples are pi,e and Square root 2.
Many square roots, cube roots, etc are irrational. If the decimal places go on forever without repeating, they are irrational.
Now back to rational numbers. These can be separated down further to natural numbers and integers. Integers are any positive whole numbers, negative whole numbers, zero. Whereas natural numbers are just from 0 and the positive numbers.
Strangely there is no general agreement amongst mathematicians about whether to include 0 in the natural numbers or not. Sometimes 0 is included, sometimes it isn’t. If 0 isn’t considered a natural number, then a whole new category is needed, called whole numbers. Which is exactly the same as natural numbers but also includes the 0. So there we have the real number system. The number 1, for example, is a natural number, a whole number, integer, rational number, and a real number.
VISIT us at www.fuseschool.org, where all of our videos are carefully organised into topics and specific orders, and to see what else we have on offer. Comment, like and share with other learners. You can both ask and answer questions, and teachers will get back to you.
These videos can be used in a flipped classroom model or as a revision aid.
Access a deeper Learning Experience in the FuseSchool platform and app: www.fuseschool.org
This Open Educational Resource is free of charge, under a Creative Commons License: Attribution-NonCommercial CC BY-NC ( View License Deed: http://creativecommons.org/licenses/by-nc/4.0/ ). You are allowed to download the video for nonprofit, educational use. If you would like to modify the video, please contact us: info@fuseschool.org

Respiration is the chemical process that supplies the body with energy for all other life processes: growth and repair of cells, muscle contraction, protein synthesis, sending nerve impulses, absorbing molecules in active transport to name just a few.
It happens in ALL living cells, not just anima

An acid is a substance that will dissociate in water to give a proton (or H+ ion) and a conjugate base. An acid is considered to be strong if dissociation nears 100%, and weak if dissociation is usually less than 1%.
In this lesson, we will learn about strong alkalis and weak alkalis.
An alkali

Watch the final part of the 'using moles' videos, to complete your understanding of the chemical calculations topic.
JOIN our platform at www.fuseschool.org
This video is part of 'Chemistry for All' - a Chemistry Education project by our Charity Fuse Foundation - the organisation behind The Fuse S