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As a non-native speaker, is “sum 7x8” an error? Shouldn’t it be “product 7x8”?


In (British) English, equations are sometimes called 'sums'. It's a confusing colloquialism, and you're right to be confused by it.


American vs. British English usage. sum is an acceptable general term in British usage. In American English, it would indeed need to be product.




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