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Generally express numbers one through ten in words rather than figures, and spell out units of measure indicating depth, height, length, weight, width.

The word by is preferred, but the lowercase symbol “x” is acceptable in informal usage.

Hyphens are used in compound modifiers with numbers when they precede nouns.

He is five feet five inches tall; a five-foot-five-inch man; a five-foot-five man,
—or he is five feet five, or he is five five
a seven-footer on the basketball team
a five-foot-three woman; she is five three
a 300-pound chimpanzee, a 300-pounder
a seven-pound three-ounce koala
the troika was 20 feet long, 9 feet wide, and 6 feet high
a three-acre farm, but a 3.4-acre farm
a 3,000-square-foot swimming pool
a 20-meter (65.6-foot) stretch of grass
the chamber was six feet long by six feet wide
an eight-by-ten-foot rug, an eight-by-ten rug,
a three-by-five-inch card, a three-by-five card, a three-by-five
Informally: a 4 x 6 inch print, a 4" x 6" print, a 4 x 6 print