English version

do your sums

From Longman Dictionary of Contemporary Englishdo your sumsdo your sumsBritish English informalCOUNT/CALCULATE to calculate whether you have enough money to do something Do your sums first before you decide how much to spend. sum
Examples from the Corpus
do your sumsWe can accumulate the figures and we can all do our sums.I did my sums and I knew I could pay him.You will have to do your sums.
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