What did they do wrong? Most problem sets in a math textbook have at least one problem where they look at a student’s work and they have to figure out what the student did wrong and how to fix it so that the problem is solved correctly.
I love problems like this because it really challenges the students to look for mistakes, a great practice to learn for checking answers! Considering how great these types of questions are, we don’t ask them enough.
Training our students to evaluate work and find mistakes can be one of the most useful things we teach them in math (and other subjects!). This is why when I noticed my co-taught Algebra students making common mistakes consistently while learning to solve one step equations, I wanted to give them some training on catching their own mistakes without simply telling them to check their work. The best way to do that, I’ve found, is by turning it into a game! Here's how to do it:
Find the mistake:
I love playing this game and hearing the students explain their answers as well as “someone else’s” mistake out loud. It is great to see those a-ha moments and class just flies by!
Try it out and let me know how it works in your class!