Year 8: Evaluate percentages

This cheat sheet will help you quickly and accurately calculate percentages in your Year 8 Maths lessons.

Key Concepts

• Percentage: A way of expressing a number as a fraction of 100. (e.g., 50% means 50 out of 100)
• Percentage = (Part / Whole) x 100

Calculating Percentages

Finding a Percentage of a Number

1. Example 1: Find 20% of $60.
2. 1. Identify the part (20) and the whole ($60).
3. 2. Write the equation: (20 / 100) x $60
4. 3. Calculate: (0.20) x $60 = $12
5. Answer: 20% of $60 is $12
6. Example 2: Find 75% of 80.
7. 1. Identify the part (75) and the whole (80).
8. 2. Write the equation: (75 / 100) x 80
9. 3. Calculate: (0.75) x 80 = $60
10. Answer: 75% of 80 is $60

Calculating the Percentage of a Number

To find the percentage of a number, use the formula: Percentage = (Part / Whole) x 100. Make sure your answer is expressed as a percentage (use the % symbol).

Don't forget to convert decimals to percentages by multiplying by 100.