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136. Distributive Numerals are declined like the plural of bonus.

Note— These answer the interrogative quotēnī (how many of each? or how many at a time?).

1. singulī one by one	18. octōnī dēnī or duodēvīcēnī	300. trecēnī
2. bīnī two by two	19. novēnī dēnī or ūndēvīcēnī	400. quadringēnī
3. ternī, trīnī	20. vīcēnī	500. quīngēnī
4. quaternī	21. vīcēnī singulī, etc.	600. sescēnī
5. quīnī	30. trīcēnī	700. septingēnī
6. sēnī	40. quadrāgēnī	800. octingēnī
7. septēnī	50. quīnquāgēnī	900. nōngēnī
8. octōnī	60. sexāgēnī	1000. mīllēnī
9. novēnī	70. septuāgēnī	2000. bīna mīlia
10. dēnī	80. octōgēnī	10,000. dēna mīlia
11. ūndēnī	90. nōnāgēnī	100,000. centēna mīlia
12. duodēnī	100. centēnī	etc.
13. ternī dēnī, etc.	200. ducēnī

137. Distributives are used as follows:

a. In the sense of so many apiece or on each side.

singula singulīs one apiece (one each to each one)
agrī septēna iūgera plēbī dīvīsa sunt i.e. seven jugera to each citizen (seven jugera each), etc.

b. Instead of cardinals, to express simple number, when a noun plural in form but usually singular in meaning is used in a plural sense.

bīna castra two camps¹

With such nouns trīnī, not ternī, is used for three.

trīna castra² three camps

c. In multiplication.

bis bīna twice two
ter septēnīs diēbus in thrice seven days

d. By the poets instead of cardinal numbers, particularly where pairs or sets are spoken of.

bīna hastīlia two shafts (two in a set)