What basic addition math facts do people get wrong the most?

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

Most frequent incorrect answers for 7 + 8

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.

Median time to answer for 7 + 8

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