Numbers, measurements and units

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See Notes for Authors p. 22 for detailed guidance. Brief guidelines as below: • use numerals o whenever a number is followed by a unit symbol (for example kg, m) o for references to illustrations o for dates, page numbers, percentages and expressions of time o where several numbers are used in succession, some less and some more than ten, use numerals throughout o use decimals and never fractions • use words o for numbers from one to ten; numerals for larger numbers o in whole numbers containing several zeros, either substitute a word for part of the number (e.g. 16 million instead of 16 000 000) o do not begin a sentence with a numeral • spaces and markers o use a full point for the decimal marker e.g. 16.6 kg o numbers with up to four digits or fewer on either side of the decimal marker are set without spaces or commas: 616, 1684, 0.8333 o numbers with more than four digits are divided by a fixed space, not a comma, every three digits from the decimal marker: 25 000, 1 584 000, 0.616 42 • units o millions: use m and decimals: 1 m, 1.5 m, 20 m o billions: use bn and decimals: 1 bn, 1.5 bn, 20 bn o per cent should be spelt out, not %