In AP Latin, number is the grammatical category that marks a word as singular or plural; nouns show it through case endings (along with case and gender), and verbs show it through personal endings (along with person, tense, voice, and mood).
Number is one of the core properties baked into almost every Latin word ending. Nouns and adjectives carry case, number, and gender. Verbs carry person, number, tense, voice, and mood. So when you see puella amat versus puellae amant, the endings are telling you who is acting and how many of them there are. English mostly marks number with a lonely -s; Latin marks it on nouns, adjectives, pronouns, participles, AND verbs, all of which have to agree with each other.
That agreement is the real payoff. A verb must match its subject in number. An adjective or participle must match its noun in case, number, and gender. A relative pronoun must match its antecedent in number and gender. When word order gets scrambled in Catullus's poetry (and it will), number agreement is one of your most reliable tools for figuring out which words belong together.
Number sits at the heart of learning objectives 1.1.C, 1.2.C, and 1.3.C, which all ask you to describe how grammar contributes to the meaning and function of Latin words in context. The essential knowledge spells it out directly. Latin nouns have case, number, and gender, and Latin verbs indicate person, number, tense, voice, and mood. In Unit 1's Catullus readings (Topics 1.1-1.3), number does heavy lifting. Catullus 5 and 7 literally count kisses with mille and centum, and Catullus 64 stretches singulars and plurals across long hyperbaton, where matching a plural adjective to its faraway plural noun is the only way to untangle the line. If you misread number, your literal translation breaks, and literal translation is exactly what the exam grades.
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Participle (Unit 1)
A participle is a verbal adjective, so it must agree with its noun in case, number, and gender. Spotting that a plural participle can't modify a singular noun is often how you crack a tangled Catullus line.
Relative Clauses (Unit 1)
A relative pronoun takes its number and gender from its antecedent but its case from its own clause. Number is half of the matching game that links qui, quae, or quod back to the right noun.
Perfect Tense (Unit 1)
Verb endings bundle number together with person and tense. Amavit versus amaverunt is the same tense with different number, and translating 'he loved' when the text says 'they loved' costs you points on a literal translation.
Ablative Absolute (Unit 1)
The noun and participle inside an ablative absolute must agree in number (and case and gender). That agreement is what tells you the two ablatives form one self-contained phrase rather than floating separately.
Number shows up everywhere translation is graded. The literal-translation FRQs (like the 2017 short answer asking you to translate a Caesar passage 'as literally as possible') score singular versus plural as part of accuracy, so 'the soldier' for milites is a lost segment. Short-answer grammar questions can ask you to identify the case, number, and gender of a noun or explain agreement between words. Watch for the noun numerus too. The 2018 short answer passage uses aliquo sunt numero atque honore, where numero means 'account' or 'esteem,' not a literal count. That's the polysemy skill from LOs 1.1.B-1.3.B in action. Multiple-choice questions on Catullus also probe numerical expressions directly, like the syntactic pattern Catullus builds by repeating dein/deinde with numbers in the kiss-counting poems.
Grammatical number is the singular/plural property encoded in endings. Numerals are actual counting words like mille, centum, and unus. And numerus the noun is a vocabulary item that often means 'rank' or 'account' rather than a literal number, as in Caesar's aliquo sunt numero atque honore ('are of some account and honor'). On the exam, 'identify the number of this noun' means singular or plural, not a digit.
Number is the grammatical category that marks words as singular or plural, and Latin shows it on nouns, adjectives, pronouns, participles, and verbs.
Latin nouns have case, number, and gender, while verbs indicate person, number, tense, voice, and mood, exactly as stated in the Unit 1 essential knowledge.
Agreement in number is your decoding tool. Verbs match subjects, adjectives and participles match nouns, and relative pronouns match antecedents.
On literal-translation FRQs, rendering a plural as a singular (or vice versa) counts as an error, so check every ending before you translate.
Don't confuse grammatical number with the noun numerus, which often means 'rank' or 'esteem' in context, as in Caesar's description of the Gauls.
In Catullus 5 and 7, numerical expressions like mille and centum drive the kiss-counting structure that multiple-choice questions love to ask about.
Number is the grammatical property that marks a word as singular or plural. Latin nouns carry case, number, and gender through their endings, and verbs carry person, number, tense, voice, and mood.
No. Grammatical number is the singular/plural property in a word's ending, while numerals like mille (1,000) and centum (100) are counting words. Catullus uses numerals to count kisses in poems 5 and 7, but every word in those poems still has grammatical number.
No, and this trips people up. Numerus is polysemous, so in the 2018 short-answer passage Caesar writes aliquo sunt numero atque honore, meaning the men are 'of some account and honor.' Context clues (LOs 1.1.B-1.3.B) tell you which sense fits.
Mostly through translation accuracy and agreement. Literal-translation FRQs dock segments for singular/plural errors, and grammar questions ask you to identify a noun's case, number, and gender or explain why two words agree.
Catullus scrambles word order, especially in poem 64, so adjectives sit far from their nouns. Matching number (along with case and gender) is how you reconnect separated word pairs and translate the line correctly.