1. Mock GCSE Revision Week 1 of 4 weeks Algebra & Number topics
Percentages
Factorising difficult quadratics “man lifting weights”
Using the quadratic formula

2. Percentages 7 question types: One number as a percentage of another
Write a decimal or fraction as a percentage
Finding a percentage of an amount
Finding what an increase/decrease is as a percentage
Increasing an amount by a percentage
Finding the original after an increase/decrease
Compound interest / depreciation

3. One number as a percentage of another
NON-CALC Q: What is £36 as a percentage of £80
Write as a fraction and multiply by 100.
Write decimal or fraction as a percentage
Fractions – write as an equivalent fraction over 100
Decimals – multiply by 100

4. Finding a percentage of an amount
Find 8% of 110
Write 8% as a decimal and multiply ie x 0.08
110 x = 8.8

5. Finding what an increase/decrease is as a percentage
Also known as “percentage change” questions
An item bought for £154 is sold for £175
Find the percentage increase, correct to 3 s.f.
The amount it changes, whether up or down it doesn’t matter. Use a positive number.

6. Increasing/decreasing an amount by a percentage
Increase 650 by 12%
Multiplier is
Decrease 1110 by 11%
100% + 12% as a decimal, i.e. 1.12
100% – 11% as a decimal, i.e. 0.89

7. Page 25
M2.1 Q10 onwards
THEN Page 27 M2.2 Q1 onwards

8. Page 380
Ex M3.3 Q1-8, 11, 19