In British English, collective nouns take either singular or plural verb forms. The individual members of the family have decided. in fiction George Bernard Shaw says that the United States and United Kingdom are "two countries divided by a common language"; and Oscar Wilde says that "We have really everything in common with America nowadays, except, of course, the language" (The Canterville Ghost, 1888). Hence, the British will say and write that Napoleon’s army are on their way.
Of course ‘maths’, with or without S, IS (not ARE) singular. Rarely do I hear people here in the US say "the team were good last night". But in American English, it's singular. Therefore, there it is being said that the army is on the way. Example: My family have decided to go to a concert. In American English, all collective nouns take the singular verb form. This divergence between American English and British English has provided opportunities for humorous comment: e.g. There are othervrules governing irregular verbs, but they are still the same for American and British English. If you disagree, please give examples. If you disagree, please give examples. In British English, a collective noun is often treated as a plural entity. But — on the other hand — it has to do with quantity.

I understand that 'don't' is used when speaking in both the first/second person plural/singular and the third person plural (I, you, we, and they), and that 'doesn't' is reserved for the third person singular (he, she, and it); the way I see it, 'maths' functions as a singular noun in this sentence, if only for the reason that you'd refer to 'maths' as an 'it', not a 'they'. As a language teacher, I'd like to know. This is just an issue of dialectal. Some confusing answers here about singular and plural. In American English, collective nouns are almost always used with the verb in … However, if the emphasis is on the individual members of this group, we use the verb in the plural. But the S has nothing to do with plurality. In the case of the "Colts play" the formal noun is plural, therefore making the verb plural. Both are fine. American English. This singular plural difference is one that we see reflected in a number of other nouns in English.