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informal often in imperativeMake a calculation or come to a conclusion based on the relevant facts and figures, typically with the implication that the result is or should be obvious.
‘I have four children and one on the way; you do the maths’
‘Your cut-price carrier ticket is around a third of the price of the full fare—do the maths.’
‘This year's expected yield of 10,000 pounds of plums is enough to feed—well, you do the maths.’
‘Just do the maths: most people I know will be really out of pocket, by several thousand dollars a year.’
‘When I finally got back to Victoria it was quarter past eight, we were supposed to be due in at half five. You do the maths!’
‘I'll leave you to do the maths on that one, and to work out for yourself whether 10% is a "rapid" rate of depreciation.’