Ratios


In this tutorial, we learn all about Ratios.
How to write them
What proportion is
How to simplify ratios
Use correct notation for ratios


In this tutorial, we learn about how to write ratios in the form 1:n and n:1 using the unitary method.
We then use these concepts to solve some tricky exam questions


In this tutorial, we learn about sharing amounts in a given ratio.


In this tutorial, we learn how to convert a Ratio to a Fraction.


In this video, we’ll look at the how to find the fraction of an amount.


This is the first video in this series where I introduce you to what we mean by a percentage.


I now show you how to find a percentage of a quantity which is a common task in working with percentages.


Next, I move on to show you how to convert a fraction to a percentage. Again this is a common task in working with percentages.


You will need to be able to calculate a percentage change such as a percentage profit / loss or percentage increase / decrease. This video shows you how.


I now work through a quick method to increase or decrease a quantity by a percentage.

Examples


In this tutorial, we learn what are multipliers and how to use them to work out amounts that have been increased or decreased by a certain percentage.


In this tutorial, we learn about simple interest and how to use the PIN formula to easily solve simple interest problems using a calculator.


In this tutorial, we learn about compound interest and how to solve ALL types of Compound interest problems.


In this tutorial, we learn about reverse percentages and how to solve problems using proportion and multipliers.


In this tutorial, we learn all about direct proportion with several examples using formulas and we learn how to find the constant of proportionality.


In this tutorial, we learn all about inverse proportion with several examples using formulas and we learn how to find the constant of proportionality.


In this tutorial, we learn about how to convert between ratios and equations using a simple trick. We then use this trick to solve harder ratio problems.


Introduction to Distance-Time graphs
In this tutorial, we learn about the features of linear Distance-Time graphs and how to draw them.


In this tutorial, we look at further distance-time graph problems.


In this video, we’ll look at how to work out the density of solids and liquids given the mass and volume. Pay attention to the units!