Compiled from game play data on FactFreaks, these are the 20 addition math facts that people get wrong the most.*Click on the operation buttons above to change the data displayed.*Sample Size: 6.62mUpdated Every 24 Hours

An asterisk following a number denotes an initial digit entry error, prompting immediate game termination. For instance, entering '2' as the first digit in response to '9 * 9' constitutes an error.

! indicates users answered "impossible". The impossible answer is only correct when a fact is mathematically impossible to answer, such as 2 / 0.