Money & finance
Money & finance
Build a monthly budget with four numbers
A useful budget starts with comparable amounts, simple categories and a clear distinction between expenses and goals.
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28 articles
Everyday life
Everyday life
Watts and kilowatt-hours: power or consumption?
A device's power and the energy it consumes are different quantities. Usage time links them.
Read the articleMathematics
Mathematics
Mean or median: what does each number tell you?
Two indicators can describe the same series and tell different stories. The choice depends on the question asked.
Read the articleEducation & science
Education & science
Calculate your average with coefficients
A coefficient gives weight to a mark. A weighted average accounts for these differences without duplicating values.
Read the articleEveryday life
Everyday life
Calculate journey cost without forgetting units
Distance, consumption and price per litre: three inputs estimate fuel. Other expenses are added afterwards.
Read the articleHome & renovation
Home & renovation
How much paint should you allow for a room?
Area, number of coats and product coverage are enough to establish an initial consistent estimate.
Read the articleUnit converters
Unit converters
Convert length, area and volume
A factor of 100 is enough to go from metres to centimetres. For square or cubic metres, you need to go further.
Read the articleMoney & finance
Money & finance
Markup and margin: choose the right denominator
The same gross margin in euros can give two different percentages. The rate depends on the value you compare it with.
Read the articleMoney & finance
Money & finance
Simple or compound interest: see the difference
The difference lies in what earns interest: the initial principal alone, or principal increased by previous interest.
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