OBJECTIVE When presented with various shapes, to write down the shaded area as a fraction, decimal and percentage
Arithmetic
Learning Outcomes Learn ng Outcome
• To be able to do all kinds of calculations involving percentages. earning Outcomesi
• To be able to manipulate numbers written in scientifi c notation and to use these numbers to make estimates based on order of magnitude.
• To appreciate the importance of tolerance levels and errors.
• To be able to round off numbers and hence estimate and approximate the values of expressions involving such numbers.
• To be familiar with the concept of quantities changing with time, including speed and acceleration.
• To understand how quantities can be directly and inversely proportional to each other.
2 1 Percentages Y 8
centages ACTIVITY
Percentages play an important part in our daily lives. You often hear statements like ‘The footballer gave 110%’ or ‘House prices are up by 7%’. A percentage just means part of 100.
1 __
2 = 50 ____
0⋅37 = 37 ____
100 = 50 parts of 100 = 50 per cent = 50% 100 = 37 parts of 100 = 37%
A percentage is simply a fraction in which the denominator is 100. Per cent is represented by %.
