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PowerPoint Presentation on Percentages – Percentage Changes (11 slides): Reviews terminology: per annum, simple and compound interest, appreciation and depreciation. Explains how to calculate the end result after a percentage increase or decrease using the ‘add on / take off’ method, as well as the ‘multiplier’ method.

This is 1 of 7 PowerPoint Presentations on Percentages, written by a highly experienced teacher (of 25+ years), senior examiner and reviser for Maths and Stats examinations. The full set of 7 (93 slides, excluding Title Pages) can be purchased at a discounted price from www.apt-initiatives.com and covers the following percentage-based topics:

01 Percentages – An Introduction (9 slides): Reviews the meaning of percent(age) and explains how to find what percentage of a diagram is shaded.
02 FDP Conversions (16 slides): Reviews expressing as a fraction, finding equivalent fractions, cancelling fractions down and that the line in a fraction tells you to divide. Explains how to convert between fractions, decimals and percentages.
03 Express as a Percentage (17 slides): Explains how to express one value as a percentage of another using equivalent fractions or a calculator.
04 Percentages of Amounts (13 slides): Explains how to calculate percentages of amounts with and without a calculator.
05 Percentage Changes (11 slides): Reviews terminology: per annum, simple and compound interest, appreciation and depreciation. Explains how to calculate the end result after a percentage increase or decrease using the ‘add on / take off’ method, as well as the ‘multiplier’ method.
06 Compound Percentages (12 slides): Explains how to calculate the end result after a number of percentage increases or decreases have taken place.
07 Reverse Percentages (15 slides): Explains how to find the original value given the end value and the percentage increase or decrease that was applied.

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