ESTIMATING (Mathstart, Level by Stuart J. Murphy - Knowing how to estimate is an essential skill that helps children determine approximate totals as well as check the reasonableness of their solutions to problems.
It adds more rigor if students create their own equations and develop their own design. Have students create a certain number of each type of line, have them identify slope, y-intercept, etc. to cover more of what I am teaching on the concept.
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