20 Questions
Which of the following best defines a percentage?
A ratio of two quantities expressed as a fraction of 100
What does 50% of a number mean?
Half of the number
What is the percentage increase or decrease a measure of?
How much a value has changed compared to its original amount
If a value is greater than its original amount, it has ___.
Increased
If a value is less than its original amount, it has ___.
Decreased
What does it mean to express one quantity as a percentage of another?
To find the ratio of the two quantities
What is the formula to calculate a given percentage of a quantity?
Percentage = (Percentage value / 100) * Quantity
What is the formula to calculate percentage increase or decrease?
Percentage change = (Change / Original amount) * 100
What does it mean to carry out calculations involving reverse percentages?
To find the cost price given the selling price and the percentage profit
What does the term 'percentage' mean?
Number of parts per one hundred
Which of the following is the correct equation to find the result of a percentage increase?
original amount + percentage change
What does 50% mean?
1/2
How do you find 10% of 150?
10/100 × 150
How do you convert a decimal into a percentage?
multiply by 100
What is the percentage error in Nicola's calculation if she measures the length of her textbook as 20cm, but the actual length is 17.6cm?
13.64%
What is the formula to find the original value when given the new value and percentage change?
original value = new value × 100 / (100 + %change)
What is the formula to calculate the amount in a bank after 1 year with a given percentage increase?
new value = 100 + percentage increase × original value / 100
What is compound interest?
Interest that is calculated monthly
What is the formula to calculate compound interest?
original value × (1 + percentage increase)^number of years
How many of a certain rare breed of animal will be left at the end of 2005 if their number decreases by 12% each year?
3872
Test your knowledge of percentages with this quiz! Practice calculating percentages, solving percentage problems, and understanding the concept of percentage. Perfect for GCSE maths revision.
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