The total looks wrong, so you should check the math.
check the math
idiomTo verify the source or accuracy of something.
Before we sign this contract, we need to check the math to ensure the final price is correct.
The analyst was forced to check the math behind the projections after the board members questioned the validity of the reported growth figures.
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check and balance
Provide mutual oversight and limitation by independent organizations in order to prevent abuses of power.
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check is in the mail
A common excuse used by debtors to put off creditors.
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check through
To permit someone to continue onward, e.g. through a security checkpoint, after verifying their identity, tickets, etc.
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do the math
To determine the explanation for or precise nature of a situation, such as the motive underlying someone's behavior, based on available facts.
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gut check
An honest, reflective appraisal of one's true feelings concerning a matter of concern.
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reality check
A wake-up call; a reminder.
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spot check
A cursory inspection or examination, especially of a sample of something.
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take check
To take offence.