# Chipmunk Error Analysis

1March 6, 2014 by ray_emily

Getting kids doing error analysis in math class has been hugely beneficial, this year. I am beyond-words thrilled that I’ve stumbled across this way to get sixth graders analyzing, discussing, and writing multi-paragraph, thoughtful explanations (!!) of student mistakes and why they happen.

We did a second go-round of blog posts / error analyses using the same method as last time, but I offered up a different batch of errors.

This time, Alvin, Simon, and Theodore (har, har…) were the students in need of help. Each chipmunk encountered a different, unique problem when attempting to do multiplication (of fractions and decimals) and long division (with two-digit divisors).

Alvin doesn’t change the mixed numbers to improper fractions:

Simon is obsessed with lining up decimal points – as well as the standard algorithm for adding decimals:

Theodore forgets zeros in the quotient:

Feel free to use these errors to drum up discussion in your classroom! Making kids write about the errors is not obligatory – but I think it had a huge impact on retention. Also, I’m seeing my kids get better and better at locating errors, thinking up reasons why students might make errors, and articulating their thought processes. Hurrah!

Well presented. Students learn best by rationalizing their own errors