How would you work out the price of a trip if it is usually £24 but a man has a railcard that gives him 30% off?
In order to work out 30% off something you can use two methods. I'll explain both.
Method one:
- Work out 30% of the total price. This would be the same as working out 10% (dividing by 10 = £2.40) and multiplying the result by 3 (because 10*3 = 30). This would give £2.40 * 3 = £7.20.
Note: If working out 10% is difficult, this can be explained as dividing by 10, or moving the decimal point one place.
- Subtract this number from the total original price to find out how much the new price would be. £24 - £7.20 = £16.80. This calculation can be done using a variety of methods: subtracting 7 first, then 0.2; column subtraction.
Method two:
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'30% off' is the same as paying 70% of the original price because 100% - 30% = 70%.
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You would work out 10% of the total ticket price (£2.40) and multiply this by 7 because (107 = 70). The answer is therefore £2.407 = £16.80
Note: If multiplication by 7 is difficult. You can add 2.40 + 2.40 + 2.40 + 2.40 + 2.40 + 2.40 + 2.40 = 16.80 to check your work. However, this is a much longer route.
