Assessment Problem:

3( x + 2) = 12

x + 2 = 4

a) What step did the student use to get from the first line to the second line?

b) Do you think that this way of starting this problem is (a) a very good way; (b) OK to do, but not a very good way; (c) not OK to do?

c) Explain your reasoning

Mathematical Issues:

This task assesses students' ability to solve equations using non-conventional methods.

Domain:

Algebraic Relations

Theme:

Solutions

Common Core Standards:

A-REI.3

Technology:

The Cover-Up app also demonstrates the value of informal procedures in solving equations.

Research References:

Rittle-Johnson, B., & Star, J. R. (2007).