This calculator teaches the basics of algebra in setting and determining unknowns. Enter the
known and unknown values in your percentage problem. In algebraic format, place an "X"
in the box where the "Value" is unknown. Click "Calculate". The unknown will be replaced by the
correct value. The tutor will display the formula and the logic for the problem. You can learn how
the equation was derived and calculated from the data in the information box. The value (first variable);
is this percentage (second variable); of the amount (third variable). Any of the three can be the
unknown by placing the "X" in the respective box and inserting values in the other two.
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For example, if you wish to know "What is the Value for 10 Percent of the Amount, 500?"; you
would place an "X" in the Value box, 10 in the Percentage box, and 500 Amount box and click on
Calculate. The answer of 50 would appear in the Value box and the formula would be given in the Formula
Information area. The "X" can be in any box in order to determine that information. You must supply
the other two values; the "X" must be present in order for the calculator to work. It is an effort
to teach new algebra students the "variable" thought process.
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