1
Method 1: Convert to decimal and multiply
30% of 80 = 0.3 × 80 = 24
2
Method 2: Find 1% then multiply
1% of 80 = 0.8, so 30% = 0.8 × 30 = 24
3
Method 3: Use building blocks (10%, 5%, 1%)
30% = 3 × 10% = 3 × 8 = 24
This deep dive covers Method: Finding a Percentage of an Amount within Percentages for GCSE Mathematics. Revise Percentages in Number for GCSE Mathematics with 14 exam-style questions and 22 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 4 of 16 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Practice questions for Percentages
Which calculation correctly finds 35% of £240 using the decimal method?
Which formula correctly expresses one quantity as a percentage of another?
Quick recall flashcards
Percentage to decimal
Divide by 100
75% = 0.75
8% = 0.08
150% = 1.5
Move decimal point 2 places left
What is a percentage?
Parts per hundred
Percent = per cent = per 100
% symbol means 'out of 100'
50% = 50/100 = half