Percentages notes

17 notes by 15 users

This page gathers Percentages notes, from quick calculation tips and conversions to percentage change and interest. The notes support school students practising percentage methods and teachers looking for material; most are aimed at secondary level. Explore more than 10 notes and choose one to start.

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Percents etc... Latoya mdg
Error and Percent Error NOTES: actual = 500.0 ft Trials:                        Error      &nbsp... Emilia Lehnhoff Faillace
Error and percent error Example: actual: 500.0 ft trials 503.5 ft - 500 ft = 3.5 ft 502.8 ft - 500 ft = 2.8 ft 497.4 ft - 500 ft = -2.6 ft   erros = measured value - actual values  Percent error = |error|/ actual value x 100% &nbsp... Daniela Flores Barillas
Percentage rules of thumb Quick TipsTo find 5%, find 10% and divide it in twoTo find 15%, find 10%, then add 5%. To find 20%, find 10% and double it.To find 25%, find 50% and then halve it.To find 60%, find 50% and add 10%.To find 75%, find 50... jessiepgould
Reverse Percentages Notes Reverse Percentages If we have increased our value by a percentage, we add that percentage to 100. We then divide by the new number and multiply by 100.   Example   e.g.   A laptop has increased in... Jayden Simpson
Percentage Change Notes Percentage Change When a quantity increases/decreases we can find the percentage change by using the formula, difference/original x 100   Example   e.g.    Brianna buys a car for £5000. She sells i... Jayden Simpson
Maths test Question 1:Q: In a year group of 96 students, 60 owned a bike. Express 60 as a percentage of 96.A: 60 /90 x 100 = 62.5% Question 2:Q: Work out 12.5% of £600A: 10%=60   1%=12   0.5%=360=12=3= 75 Question 3:Q:... Ishveer Sangha
The Percent Porportion Types of Percent ProportionTypeExampleProportionFind the Percent What percent of 5 is 4? 4/5 = n/100 Find the Part What number is 80% of 5? p/5 = 80/100 Find the Whole 4 is 80% of what number? 4/w = 80/100Find the Per... aiaprilgirl
error and percent error error= measured value-actual value percent error= error          X100%                     actual value percent error= measured value-actual v... Paula Nicole Girón Lemus
Untitled Jessica 'JessieB
Percentage Revision Percentages work out 95% of 85 pounds85/100 =0.850.85x95 = 80.75 15% of 200200/100=2(1%)2x15=30(15%)2x10=20(20%) alexggrace
Compound Interest, Appreciation & Depreciation Notes Compound Interest, Appreciation & Depreciation Notes When the value of something has gone up (appreciation) or down (depreciation) by the same amount over a number of years, the increase/decrease value will vary ... Jayden Simpson
Fractions to Decimals Notes Tip: Divide the percent by 100 by moving the decimal point two places to the left. A percent is a ration of a number by 100. The symbol % is used to indicate that a number is a percent. teachmagoffin
Taxes Taxes are extra amounts you have to pay when you are purchasing items. For example: A TV costs €210, with a tax of 11%210 divided by 100 X by 11 equals: 23.1 210 plus 23.10 equals:Full price equals €233.10 Note: to ge... Andrew Sherry
Maths To convert a decimal to a percent, multiply the decimal by 100, then add on the % symbol. An easy way to multiply a decimal by 100 is to move the decimal point two places to the right. This is done in the example belo... sweatycarrotcrew
Untitled Percentages QUESTIONS Increase £300 by 30% 300/10=30 30+300=330 =£330      2. Increase £25 by 25% 25/4=6.25 25+6.25=31.25 =£31.25    3. Paige Snowling
Simple Interest, Compound Interest, and Depreciation Simple Interest, Compound Interest, and Depreciation Kim Mckinlay

More Percentages resources

All Percentages resources Quizzes 73 Mind maps 40 Flashcards 56

About percentages notes

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Using percentages notes

Start with Percentage rules of thumb for short methods for finding percentages of an amount. Its tips show how to use a familiar percentage to work out another. For examples of finding percentages of amounts, read Percentage Revision next.

The notes also cover conversions between percentages, fractions and decimals. Percentage Change Notes sets out a method for increases and decreases, while Reverse Percentages Notes looks at finding an original value after a change.

Moving between formats

Read a note through, then cover its method and try to recall the steps. Check your working against the example before moving on. Notes on error and percent error, tax, interest and depreciation offer further topics to explore.

When you want to try questions without a worked example in front of you, switch to a quiz on the Percentages unit page. For a visual overview, use a mind map there instead. Pick a note and start with its examples.

Frequently asked questions

Which note should I start with?

Try Percentage rules of thumb if you want short methods for finding percentages of an amount. It shows how to use one percentage to find another. Percentage Revision is another starting point, with examples that break calculations into steps.

Are these notes free to use?

Yes. Every note listed here is free to open and study without an account. The resources were made by GoConqr users. A free account also lets you save quiz scores and make your own quizzes, mind maps, flashcards and notes.

Who are these notes for?

The notes are for school students practising percentage methods and teachers looking for material to use. Most are aimed at secondary level, and GCSE Maths is mentioned in the listed resources. Topics include conversions, percentage change, reverse percentages, error and interest.