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Follow the guidelines below when writing comparative and inclusive numbers.
For general comparisons note the following:
Note that "a four-to-one margin" is meaningless; "a margin of three" is correct.
Consecutive numbers are joined by or or and, except where intermediate quantities are possible:
but
In references to successive pages, p. 15, 16 indicates matter that is disconnected in the two pages, whereas pp. 15–16 indicates that the subject is continuous from the first page to the second.
Opinions differ on the proper forms for inclusive numbers written as numerals. Of course, it is always acceptable to write both numbers in full.
However, if you want to abbreviate the second number, follow the principles below to ensure clarity.
Repeat all digits in numbers below 100:
Repeat all digits where the first number is 100 or a multiple of 100:
Where the first number is in the range 101–109, in multiples of 100, use the changed part only in the second number, and omit unnecessary zeros:
Where the first number is in the range 110–199, in multiples of 100, use two or more digits in the second number, as needed:
With numbers of four digits, use all digits in the second number if three of them change:
Note the following special cases:
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