Decimal numbers – Grade 8 and 9 Calculations
Do the calculations to practice different operations with decimal numbers.
Grade 8 – 9 maths
Integers – Grade 8 and 9 Calculations
In this video you will have the opportunity to do specific calculations and whereafter it will be explained. Do not hesitate to refer back to our previous videos on integers if you cannot remember how to do the calculations. Remember that you should always apply the order of operations (BODMAS).
Multiplication and Division of Integers
Have you ever wondered why 3 x -2 = -6? Or in other words, why a positive integer multiplied by a negative integer result in a negative integer? Maybe you also thought of why a negative integer multiplied by a negative integer result in a positive integer, such as -3 x -3 = 9. If…
Financial Mathematics – Exchange Rate
As rate is the comparison of two quantities of a different kind, we can use the principles of rate to determine exchange rate. Exchange rate is when you exchange one country’s money with another country’s money. E.g. If we have an exchange rate of R13,95 for $1, we will exchange R10 000 for approximately $716.85….
Scientific Notation
We use scientific notation when we write very big or very small numbers. Scientific notation is when we write one number followed by the decimal symbol (in South Africa that is a comma) and then the remaining parts of the number. However, as we actually ‘moved’ the decimal symbol of the given number we should…
Common fractions to percentages to decimal fractions
What do common fractions, percentages, and decimal fractions have in common? They can all be converted into one another. When converting a common fraction, such as three quarters, into a percentage, we have to make the denominator equal to 100. How do we do that? Multiply the current denominator of fourths with 25 so that…
