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I know this wasn’t the main point of your comment, but to be grammatically correct, it would be “the maths math.”
Plural verbs go with their plural noun subject and don’t need the s:
- This book belongs on the shelf.
- These books belong on the shelf.
And like you said, maths being short for mathematics means it’s plural.
Since using “maths” as a verb is very much nonstandard, I would argue against trying to apply any rigorous rules to it. It’s about the vibes of the thing.