Rationalise the denominator means eliminating the SURD from the denominator. Here are a few examples showing how to do this operation. A full video lesson on working […]More…

# Category: Numbers

# Rounding to – the nearest… / a significant figure

There are two ways to round a number. You can round a number to a specific place value or to a specific significant figure.

# Negative Numbers – Adding & Subtracting

Adding and subtracting involving negative numbers can be challenging to some students if the rules on negatives numbers are not well understood. This article aims to provide […]More…

# Numbers – Highest Common Factor (HCF) & Lowest Common Multiple (LCM)

The best way to work out the HCF and LCM of two numbers is to use the prime factor decomposition and Venn Diagram method as it is […]More…

# Numbers – Percentages (%)

This article looks at percentages when used in the following 4 scenarios: Finding the % of an amount. Increasing / decreasing an amount by a %. Expressing […]More…

# Numbers – Reverse Percentages

Perhaps the most complex question when dealing with percentages. Reverse percentages are used when you are asked to find the original amount. For this, we will use […]More…

# Fractions – Adding & Subtracting

Getting to grips with the 4 basic arithmetic operations (Add / Subtract / Multiply / Divide ) when using fractions can easily be achieved once you know […]More…

# Finding the Upper Bound and Lower Bound

With rounding, you often get asked to find two values. These are the Upper Bound (UB) and the Lower Bound (LB) and when these 2 values are […]More…

# Negative Numbers – Multiplying & Dividing

The rules for multiplying and dividing involving negative numbers are relatively simple compared to adding and subtracting involving negative numbers. Here they are: Dividing works the EXACT […]More…

# Numbers – Factors, Multiples & Prime Factors

Getting confused with Factors, Multiples and Prime factors ??? Well! here are some examples that will hopefully shed some light on the meaning of these terms. Let’s […]More…

# Numbers – Multipliers

The concept of ‘Multipliers‘ is a useful one to know when dealing with percentage increase (or decrease) as it allows you to work out the ‘final’ value […]More…

# Numbers – Ratio (Sharing) & 1:n

Ratios usually means that there is a sharing part that is taking place. We have a quatity and we want to share it according to a given […]More…

# Fractions – Multiplying & Dividing

Multiplying Fractions. This is perhaps the easiest operation to perform on fractions. It involves multiplying the numerators together and the denominators together.

# Simple Interest vs Compound Interest

Interest calculations fall into two categories. Simple interest and compound interest. With Simple interest, you work out the interest on the initial amount based on the interest […]More…