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A novel calculator, ideal for interactive whiteboards and pen-based devices, is introduced and evaluated. The calculator provides a natural, dynamic method of entering conventional expressions by handwriting and provides continual feedback showing the calculation and results. The user interface adjusts and copes with partial expressions, morphing the expressions to correct position and syntax. Gestures are also used to edit and manipulate calculations. The user interface is declarative, in that all displays, even with partial user input, are of correct calculations. The new calculator is faster for more complex expressions and importantly, gives users more confidence in its use. The majority of users said that they would prefer to use this calculator rather than their conventional calculator.