Rounding error noun phrase
A miscalculation caused by changing a number to the next higher or lower integer or one with fewer decimals.
While rounding errors may be innocuous in manual computations, they can lead to serious mistakes in computer calculations that involve thousands or millions of mathematical operations.
When it comes to politics, stock markets, space, and the battlefield, rounding errors might have enormous consequences.
An amount that is or appears enormous when standing alone but is insignificant in comparison with a large company.
A million dollars is just a rounding error to that multinational corporation.
You should ask for raise. To such a large company, a few thousand dollars is just a rounding error.
The origin of this phrase is not clear.
To be dishonest or deceptive and no one can believe
No one believes what she said. She couldn't lie straight in bed.