# 4. Numbers

**4.1 **Spell out numbers up to one hundred except when expressing dimensions, in statistical contexts, or in tables. Use Arabic for 101+ except when beginning a sentence. Spell out hundreds and thousands.

fifteen stools, sixty-one parrots, 156 canisters, one thousand lives, 34 × 67 cm

**4.2** No commas are required for four-digit numbers (i.e. up to 9999), but should be used for every three digits thereafter (i.e. 10,000 and higher).

2400, 67,000, 207,000, 2,500,000

**4.3** Number ranges follow the "spoken number" convention.

1–45

56–76

100–102

102–6

287–88

287–91

1000–1004

1015–56

1785–893