Spell out one to nine in full and use figures for numbers 10 and above:
This goes out of the window if you have numbers both above and below nine in the same sentence. In this case, use figures throughout:
Likewise, only ever use figures in tables. You can also use them in headlines or quotes if you don't have much space, or on posters showing statistics:
Don’t start a sentence or headline with digits:
Large numbers
Write out thousand, million, billion and trillion for people or animals. Write one to nine in full and a mix of figures and words for 10 or over:
But write "m", "bn" and "trn" for sums of money, units or inanimate objects:
Never use "k" for thousand – write it out in full or in figures:
Use commas (with no spaces) to punctuate large numbers: