Percentages
Increase, discount, change, inverse rate…
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Mathematics
Percentages, rule of three, conversions...
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Rule of three
Direct/inverse three-rule, proportionality tables.
Statistics
Average, median, mode, range, and key concepts.
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VAT
Excl./incl. VAT, custom rates, quick calculations…
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Proportions & ratios
Ratios, simplification, proportions, and proportional parts.
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Fractions & decimals
Conversions, simple calculations, and simplification.
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Rounding & estimation
Rounding, significant figures, errors, and orders of magnitude.