Dates and times How to make sure dates and times are written consistently throughout our website. Numbered lists When to use and how to write a numbered list. Writing numbers Guidance about how to write numbers zero to nine and for numbers 10 and over. Percentages Guidance about when to use and how to write percentages. Money How to write about money and use currency symbols. Telephone numbers How to format telephone numbers. Ages How to write about ages, age ranges, and what terms to avoid.