![]() How much will she have after 3 years? Some people can be tempted to add together the 5% for the 3 years i.e. ![]() For example, Freya has £10 and each year this increases by 5%. One area that often catches people out is year-on-year percentage increases. When comparing percentages make sure that you have a common baseline (otherwise the percentages will be unrelated to one another). Often the multiple-choice answers to numerical reasoning tests will include incorrect answers with exactly this error, so if you have made this mistake there may well be an answer waiting to catch you out. Make sure that if you are converting decimals to percentages (or vice versa) that you get the decimal point in the right place. Then multiply that decimal figure by 100, to create the percentage.Ĭommon Mistakes and Things to Look out For To translate fractions into percentages, you should divide the bottom number in the fraction by the top number. It is very straightforward to convert numbers between these different representations, and these are key techniques to learn. When taking a numerical reasoning test, you may be required to move fluidly between questions using percentages, fractions and decimals. You can also take the decimal you converted the percentage into, subtract it from 1, then multiply the original number by it:Ġ.75 x 45 = 33.75 Converting Decimals and Fractions to Percentage Values Then subtract this amount from the base figure: To calculate the amount that should be subtracted, multiply the original number by the decimal: If you are asked to subtract 25% from 45 (for example, when calculating a discount), then you need to start by converting 25% to a decimal, which is 0.25. If you are subtracting a percentage from a whole number, you first need to convert it to a decimal. To subtract one percentage from another, just ignore the percentage signs and treat them like whole numbers.įor example, to subtract 20% from 50%, perform the sum 50 – 20 to get 30. Then convert the fraction back into a percentage: ![]() If you prefer to work in fractions, the calculation can also be done that way.įor example, if you need to multiply 10% by 30%, you would convert them into fractions out of 100 then simplify: To multiply percentages, you can convert them into decimals, multiply the decimals, convert back into a percentage.įor example, if you are asked to multiply 15% and 40% together, the calculation would look like: Therefore, the answer to £200 + 10% + 15% is 253.# How to Multiply Percentages ![]() To ensure that the number is manipulated correctly, the multiplication needs to be completed in the order that it is presented in the question:Ģ00 x 1.10 = 220 This is the first step: £200 + 10%Ģ20 X 1.15 = 253 This is the second step: (£200 + 10%) + 15% The original value is then multiplied by these numbers. Instead, you need to calculate them separately and in order.įirst, add 100 to each percentage and then convert it to make a decimal larger than 1:ġ0% becomes 110% which is converted to 1.10ġ5% becomes 115% which is converted to 1.15 If you need to find the total of £200 + 10% + 15%, the initial thought might be to calculate £200 + 25%. If you are adding consecutive percentages, unfortunately it is not as simple as adding them together and then applying that number to the problem.
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