## Percentages with a calculator

Working out percentages using a calculator is an important skill for success at GCSE, both on Foundation and Higher level. It is also one of those topics that you
will use when you leave school - for example, in working out how much interest you will receive on a savings account (banks never use non-calculator friendly percentages!). Check this link from BBC Skillwise if you need convincing.It's easy to do if you remember that "percent" means "out of 100". Let's say you want to work out 53% of £340 on your calculator. If your calculator does not have a percentage button, we need to put the calculation in terms that your calculator can understand. First of all, percent, or %, means "out of 100", so 53% is another way of writing 53/100, which you can input using either the fraction button, or key in 53 ÷ 100. Secondly, you have the "of" bit to deal with. In maths, "of" or "lots of" usually means multiply, so replace the "of" with a multiplication sign. Then put the second number, 340 (without the pound sign) in on the end. You should have keyed in 53 ÷ 100 × 340. Pressing equals should give you the answer 180.2. We were dealing with money in this question, so this should be £180.20. Many newer scientific calculators do have a percentage button. In this case, you don't have to convert the percentage to a decimal first; you can simply key in 53% × 340. Notice we're still changing the "of" to "multiply". |

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