The median of a set of numbers is what?

The middle value when they are put in order

The difference between highest and lowest

A ratio of 2:3 means the two quantities relate how?

For every 2 of the first there are 3 of the second

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Mathematics Easy ⚡ 10 Questions ⏱️ ~6 Mins +100 XP

Measures and Everyday Maths

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The maths people genuinely use — in shops, kitchens, spreadsheets and news reports.

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Questions

~6m

Duration

Easy

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About this topic

Most adults use a narrow slice of mathematics constantly and the rest of it almost never. That slice is percentages, averages, ratios and unit conversion — the arithmetic behind a discount, a recipe scaled for six, a mortgage rate or a statistic quoted on the news. This quiz stays inside that slice. There is nothing here requiring algebra or a calculator, but several questions cover the places where everyday reasoning reliably goes wrong, such as what an average does and does not tell you.

Questions & answers

Measures and Everyday Maths: all 10 questions and answers

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1What is 25% of 200?
- A 25
- B 50 Correct
- C 40
- D 75
Answer: B. 50

Why: A quarter of 200. Percentages are just hundredths, so 25% means 25 parts in every 100.
2If a £80 coat is reduced by 10%, what does it cost?
- A £72 Correct
- B £70
- C £78
- D £75
Answer: A. £72

Why: Ten per cent of 80 is 8. Successive discounts do not simply add, which is why "20% off, then 10% off" is not 30% off.
3The median of a set of numbers is what?
- A The most common value
- B The total divided by the count
- C The difference between highest and lowest
- D The middle value when they are put in order Correct
Answer: D. The middle value when they are put in order

Why: The mean is the total divided by the count and the mode is the most common. Median resists distortion by extreme values.
4How many centimetres are in a metre?
- A 1,000
- B 12
- C 100 Correct
- D 10
Answer: C. 100

Why: The prefix "centi" means one hundredth. A kilometre is a thousand metres.
5How many millilitres are in a litre?
- A 500
- B 1,000 Correct
- C 100
- D 10
Answer: B. 1,000

Why: One millilitre occupies exactly one cubic centimetre, which is why recipes and syringes use both units interchangeably.
6A right angle measures how many degrees?
- A 90 Correct
- B 45
- C 180
- D 60
Answer: A. 90

Why: Four right angles make a full turn of 360 degrees. Two make a straight line.
7If three items cost £7.50 in total, what is the price of one?
- A £2.25
- B £3.00
- C £2.75
- D £2.50 Correct
Answer: D. £2.50

Why: Dividing by the count gives the unit price, which is the only reliable way to compare differently sized packs.
8What is the perimeter of a rectangle measuring 5m by 3m?
- A 8 metres
- B 30 metres
- C 16 metres Correct
- D 15 metres
Answer: C. 16 metres

Why: Perimeter adds all four sides. Its area, by contrast, would be 15 square metres.
9A ratio of 2:3 means the two quantities relate how?
- A The second is 23% larger
- B For every 2 of the first there are 3 of the second Correct
- C The first is twice the second
- D They differ by three
Answer: B. For every 2 of the first there are 3 of the second

Why: Ratios describe proportion, not absolute size, so 2:3 and 20:30 are identical.
10Which of these is equal to one half?
- A 0.5 Correct
- B 0.05
- C 1.5
- D 5.0
Answer: A. 0.5

Why: One half is also 50%. Fractions, decimals and percentages are three notations for the same thing.

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