What does the cryptic crossword clue "What pupils learn about in maths class — talk about noise! (8)" mean?

The definition is "What pupils learn about in maths class". The wordplay uses a charade (building blocks). OR (synonym="DIN") + DIN (synonym="DIN") + ATE (synonym="DIN") = ORDINATE The answer is ORDINATE.

What pupils learn about in maths class — talk about noise! (8)

Times Cryptic #29011 | 2 Down | 2024-09-02 flower

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