How did this kid come to believe in this algorithm?
Thanks to Amy Burk for the submission.
This is a snapshot of a book by Robert Ashlock, Error Patterns in Computation.
Penny for your thoughts in the comments. How does a book like that relate to a blog like this?
Also, jump in if you have anything interesting to say about this sort of fractions error.
Today isn’t a sample of student work, exactly. It’s an interview with a kid.
[Source: How Students Learn: Mathematics in the Classroom, p.314]