Use figures in dimensions when written thus: a lot 4×6 feet.
All ages shall be written thus: John Smith, 8 years old. Do not write it: John Smith, aged 8, or aged eight. It will be easy to remember the rule if you observe that in writing it thus: John Smith, aged 18, 48 Jones street, you are opening an opportunity for an error easily made. It may appear: John Smith, aged 184, 8 Jones street.
All ordinals are spelled out. Write it thirtieth, not 30th. Write a date: Feb. 6, not February 6th, or February sixth.
Do not use both numerals and figures spelled out in one phrase. Write it: Eight feet eleven inches. If in a phrase a number over 10 precedes a number under 10, express both in figures, thus 18 hours 4 minutes. If vice versa, express it thus: two hours eighteen minutes.
ROMAN NUMERALS
| I | 1 | XIX | 19 | CL | 150 |
| II | 2 | XX | 20 | CC | 200 |
| III | 3 | XXX | 30 | CCC | 300 |
| IV | 4 | XL | 40 | CCCC | 400 |
| V | 5 | L | 50 | D | 500 |
| VI | 6 | LX | 60 | DC | 600 |
| VII | 7 | LXX | 70 | DCC | 700 |
| VIII | 8 | LXXX | 80 | DCCC | 800 |
| IX | 9 | XC | 90 | DCCCC | 900 |
| X | 10 | C | 100 | M | 1,000 |
WEIGHTS AND MEASURES
- 7.92 inches make 1 link.
- 25 links make 1 rod.
- 16.50 feet make 1 rod.
- 4 rods make 1 chain.
- 10 chains make 1 furlong.
- 8 furlongs make 1 mile.
- 320 rods make 1 mile.
- 5,280 feet make 1 mile.
- 10 square chains make 1 acre.
- 160 square rods make 1 acre.
- 640 acres make 1 square mile.
- 43,560 square feet make 1 acre.
- 69 geographical miles make 1 degree of latitude.
- 1,728 cubic inches make 1 cubic foot.
- 27 cubic feet make 1 cubic yard.
- Gunter's chain, 22 yards of 100 links.
- A section is 640 acres.
- A township is 36 sections, each 1 square mile.
- A span is 9 inches.
- A hand—horse measurement—is 4 inches.
- A knot—nautical—is 6,086 feet.
- A fathom—nautical—is 6 feet.
- A stone is 14 pounds.
- A square acre is 208 7-10 feet on each side.