Some guidelines to follow when writing numbers:

- Any number less than nine should be spelt out.
*55 bags, four pens, eight men.* - When numbers appear together, combine numerals and words to avoid confusion.
*5 seventh-floor flats, Eight 60-Watt bulbs.* - Prefer million and billion to lakhs and crores.
- Approximate numbers above a million should be written as numeral and word.
**About 1 million****not***about 1000000.* - Fraction figures should be written as words.
**One quarter of the pie, a sixth of the students, a half of the bottle.***six-seventh.* - Use hyphen for 'to' when it appears between figures, not between words.
**20-25 people****six - eight cars.** - Ages should be in numerals.
*The minister, 48, is survived by his wife ,35 and a son, 7.* - Do not begin a sentence with a numeral. Number should either be written in words as in
or the sentence should be rewritten. Instead of saying*Fifty two people attended the wedding*it can be rephrased as*5000 copies were sold of the first edition*,*The first edition sold 5000 copies.* - All modifying numbers maybe written in numerals.
**120kmph, 20 percent, page 67.** - Unit of measurement when qualifying a noun should be in numerals and be separated with a hyphen.
*50-foot barge, 30-cm ruler, 10-minute delay.* - When many numbers are involved, use all numerals.
*The Fibonacci sequence 0,1,1,2,3,5,8....forms the basis of many mathematical formulae.* - For decimals use numerals.
*1.68, 2.05.* - Dates should be written in numerals and without ordinals.
Not*February 14, 2009*.*February 14th.* - For money write in numerals
*.***Rs. 35.50 apiece.**Also write**Rs.180 or Rs. 180.25**but not**Rs.180.00.** - While comparing do not mix fractions and percentages. It is wrong to say that
**There were 62.5 % men and only 30½ % b***oys under nine*. - For a ratio qualifying a noun, figures and hyphens should be used.
*60-40 proportion.*