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"2 Truths and a Lie" Error Analysis Math Activities

In this post you'll find "2 truths and a lie" math activities, each with error analysis questions built right in. Every activity is set up the same way-- find the error (the "lie") on each card, then correct the error on the student answer sheet. Students get practice identifying math errors in the context of different math topics, and then with fixing those errors.

Here is the first card from an integer operations "2 truths and a lie" error analysis activity. There are 3 integer operations problems on the card, along with 3 statements comparing the answers. Students solve the 3 problems then figure out which statement is the "lie". Students then fix the lie on their answer sheet.

For this slope "2 truths and a lie", students are presented with a graph, a table and a pair of coordinates, as well as 3 statements about each representation's slope. Students need to figure out which of the 3 statements is the lie, then correct that lie on their answer sheet.

Students identify incorrect statements about zeros, vertex, axis of symmetry, and/or y-intercept in this key features of quadratic graphs "2 truths and a lie". All functions in the activity are factorable.

"2 truths and a lie" error analysis activities:

You can see all individual "2 truths and a lie" error analysis math activities here: