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Direct Modeling; the use of manipulatives and drawings along with counting to represent directly the meaning of a story or problem, is the step that usually precedes invented strategies.
When you simplify, you are just taking the equation down to it's simplest form, not solving it. Evaluation involves actually solving the problem.
An equation is a ploblem with no answer and an expression is a problem with an answer so you'll get different answers with an equation and an expression.
whats the difference between solving an inequality by algebriac vs graphical
Describe how you exhibit effective problem solving skills?