Find the mistake in solving one-step equations

The  exercise appears under the 6th grade (U.S.) Math Mission. This exercise sees if students are able to identify errors in solving equations when they are written by others.

Types of Problems
There is one type of problem in this exercise:


 * 1) Find the student's error: This problem provides two steps that a solution provided to solve a particular algebra problem. The student is expected to analyze the solution, determine if an error is made, and assess where the other likely occurred.Ftmisose1.png

Strategies
Knowledge of basic algebra and an ability to read critically are encouraged to ensure success on this exercise.
 * 1) The solutions should be read carefully step-by-step to see if they are completed correctly.
 * 2) If the numerical answer is correct in the last step, then the problem was more likely than not performed correctly.
 * 3) Some common errors are to perform opposite operations on opposite sides of the equation, or minor arithmetic errors.

Real-life Applications

 * 1) This problem is much like the types of things that teachers will have to look for in their students work.