CALK is the calculator ideal with which you can make your calculations and easy way to practice. Its design is very similar to a hand-held. 7 operations you can do with the calculator: 1. Sums. 2. Subtraction. 3. Divisions. 4. Multiplication. 5. The square root. 6. Taking a percentage. 7. Share the results. Now you can share the result, just doing click on this.