Units and Fractions

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Percentage Calculation

Units and Fractions Percentage Calculation

🎬 Video Tutorial

  • (0:01) Percentage Calculation Components: The base value (original amount), percentage rate (relative percentage), and percentage value (calculated absolute amount).
  • (0:50) Applying Percentage Discount: To find a discount, multiply the base value by the percentage rate. For a £10 item with a 20% discount, the discount is £2, making the final price £8.
  • (2:13) Increasing BaseValue by Percentage: When prices increase, multiply the base value by the percentage rate and add it back. A £20 item with a 10% increase costs £22 after adding £2.

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📂 Revision Cards

Components of percentage calculation explaining the base value (£10), percentage rate (20% discount), and percentage value (£2 reduction).
1) Percentage Calculation
Calculating percentage rate with an example of a £5 original price, a £2 coupon, and a resulting 40% discount.
2) Calculating Percentage Rate
Calculation of percentage value showing a £20 base value with a 10% increase, resulting in a £2 increase and a new total of £22.
3) Calculating Percentage Value
Calculating the base value with a shopping example; spent £35, 70% discount rate, and the base value calculation shown as £50.
4) Calculating Base Value

🍪 Quiz

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Percentage Calculation

1 / 6

Q: A book costs £12 and is sold with a 25% discount. How much do you save?

2 / 6

Q: If a laptop costs £800 and you get a £160 discount, what is the percentage discount?

3 / 6

Q: A shirt originally costs £25 and is now sold at a 20% discount. What is the discounted price?

4 / 6

Q: A jacket originally priced at £40 is sold with a 25% discount. What is the discounted price?

5 / 6

Q: A television originally priced at £450 had its price increased by 20%. What is the new price?

6 / 6

Q: laptop is sold with a 25% discount, reducing its price to £600. What was the original price?

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