numbers

• Spell out one through nine. Starting with 10, use Arabic numerals. Exceptions are ages and dimensions, e.g. 5-year-old, age 2, 6-inch action figure, 4- to 6-year olds).
• Fractions: use decimals where possible.
• Percentage: spell out percent
• Square footage: 200 sq. feet of space
• Dimensions: the crane is 20 feet tall, the 20-foot tall crane, her measurements are 33"x24"x33"