This app is the same app as the free version
Please try the free version first, if you like it buy this one.
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King Calculator aims to be very simple to use while being extremely functional, it's great for simple day-to-day operations or for scientific studies and work.
The only calculator for android that supports work with fractions, you can add fractions, edit fractions and more.
Excellent for school work, college studies, science and engineering.

King Calculator is designed to be useful to almost anyone, from kids to grown-ups, so whether you are looking for a basic or advanced calculator, King Calculator is the app you want.
King Calculator got accepted to the Google in education program and being incorporated in schools who use Android devices as educational tools.

King Calculator offers a simple layout for common operations and scientific layout for when you need a scientific calculator which is also a graphing calculator

Simple calculator layout offers:
• Basic arithmetic, Exponentiation, Square root.
• Percentage calculation.
• Classic memory functionality or Casio style MRC / M+ / M- buttons and memory capabilities.
• Calculation History.

Scientific calculator layout offers:
• Trigonometric function ( Sine, cosine, tangent, arcsine, arcosine, arctan, hyperbolic • sine/cosine and tangent)
• Exponentiation
• Square and cubed root (or any other root using the exponentiation button)
• Factorial and modulo operations
• Logarithmic functions
• Absolute value function and more.
• Plotting/Graphing functions.