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Fun fact: Other than the Red Indians, who really has a right to claim American citizenship? I mean, if we’re handing out countries based on "first come, first served," most of us would be homeless.
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Any student executes tens of elementary calculations daily. Over a lifetime, we
must solve more than ten thousand multiplication problems. And yet, our arithmetic memory is at best mediocre. It takes a well-trained young adult considerable time, often more than 1 second, to solve a multiplication such as 3 × 7. Error rates average 10 to 15 percent. On the most difficult problems, such as 8 × 7 or 7 × 9, failure occurs at least once in every four attempts, often following more than 2 seconds of i
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― The Number Sense: How the Mind Creates Mathematics
― The Number Sense: How the Mind Creates Mathematics