Casio Jj-120D Plus 300 Steps Check & Correct Desktop Calculator

On Display Indication Of Active Constant (K): Easier Technique For Repeat Calculation For +, -, ÷, X . Benefits: Reduces Any Chances Of Manual Error In Repeat Calculations. E.G. Press [2] [X] [X] (K Is Shown On Screen) To Set “Multiply By 2” As Constant. Enter, 10, And Keep Pressing [=] To Get 20, 40, 80, And So On.