calculation · noun C or U /ˌkæl.kjəˈleɪ.ʃən/Full view
Nouns: calculation, calculator
Adjectives: calculated, calculating, incalculable
Verbs: calculate
B2 when you use mathematics to discover an amount or number
Dictionary example:

I did some quick calculations to see if we could afford it.

Learner example:

Just a simple calculation: the living space an elephant has got in a zoo is about 500m2. (First Certificate in English; B2; Dutch)

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