Common Pre-Algebra Mistakes
Example: Addition

The Goal

Compute:

goal


The Mistake

mistake

(Roll the mouse over the algebra to see a hint in red)


The Correction

correction

(Roll the mouse over the area above to see the correction in blue)


An Explanation

Take time to get the simple calculations right. Adding 196 to 4 gives 200, which added to 625 gives 825.

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