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Reckoner (Noun)

An expert at calculation (or at operating calculating machines).

Nouns denoting people.

The chief accountant was a skilled reckoner, able to quickly process complex financial data.
She was a human reckoner, able to perform calculations in her head with lightning speed and accuracy.
The store clerk was an expert reckoner with an abacus, using it to calculate totals and make change.
He was known as the company's top reckoner, able to analyze data and identify trends with ease.
The old-fashioned reckoner was replaced by a computer, but she still enjoyed working with numbers by hand.

A handbook of tables used to facilitate computation.

Nouns denoting communicative processes and contents.