No need to include ‘.00’ – £33 not £33.00.

Pence and cents should be 7p and 70 cents. Not 0.07p or 0.70 cents.

Ranges should be £6,000–£7,000 (not £6,000–7,000).

A dollar sign ($) is fine for American dollars, but use US$ or USD if there’s any room for confusion.

Use the euro symbol rather than writing the word out in full. So it’s €540, not 540 euros.