Mock GCSE Revision Week 1 of 4 weeks Algebra & Number topics

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Presentation transcript:

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

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

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

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

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.

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

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

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