Math Facts Approaches 600,000 Correct Student Responses

I was creating some statistics from data at Math Facts this afternoon and realized that there are 600,000 correct student responses to math fact questions so I decided that again it was time to crunch some numbers.

Statistics:
Accuracy of student responses 87.1%
732,620 addition and multiplication problems solved.
638,347 addition and multiplication problems solved correctly.

Multiplication:
464742 multiplication problems solved at 87.51% accuracy.
Average time to correctly respond to a question was 2.049 seconds.
Fastest response times: 0.05 seconds to 2 × 1 and 0.062 seconds to 1 × 1

Addition:
267878 addition problems solved at 86.48% accuracy.
Average time to correctly respond to a question was 2.692 seconds.
Fastest response times: 0 seconds to 1+2, 0.116 seconds to 1+5.

Note that some of these statistics include times when students goof around and try to complete the activity as quickly as possible not paying attention to accuracy at all. But this is a very small percentage overall.

Observations:
I find it interesting that students respond on average about 0.5 seconds slower to addition problems than multiplication. Also it is interesting that the accuracy of the addition is 1% less than that of multiplication.