2numbers vs CalcKing Pro

Do you ever happen to make the accounts with the percentages and to not know or not be sure of the right operation to do ? For example the cell phone you are looking for and that you had seen at $499 now costs $420 and you want to know how much is decreased in %. With 2numbers it is not necessary to know the operation to do, simply enter the 2 numbers and tap '='. You will come out a list of operations with those 2 numbers and its results. So the operation 499 - 15,83% = 420 tells you that the cell phone costs the 15,83% less. • the list contains 10 operations with percentage and other 4 with + - x ÷ • the operations are easy to read, the results are highlighted by a different color • you can reorder the operations in the list, so to show for first the most used ones • a touch on the operation that interests will add that operation to the sheet for calculation • the operations added to the sheet for calculation, show in the right hand column the results with the Total that stay always up to date • the entire content of the sheet for calculation can be exported • the 2 numbers can have up to 10 digits • ... It's an APP that you will use more often than you think, and all of the listed functions and still others are free and without advertising. P.S. There is also an in-app purchase that in addition to the Dark Graphics gives you quick access to operations + - x ÷

Professional engineering calculator, the mobile computing tool for engineers! No ad interference: Specifically designed for engineers, with a pure usage experience and no pop-up ads. Full coverage of core functions: Basic scientific calculations: Trigonometric functions, logarithms and exponents, power operations, constant calls (π/e, etc.), support for degree/radian conversion, meeting general calculation needs. 12 types of unit conversions: Length, weight, area, volume, temperature, speed, etc., covering meters/cm/inches, kilograms/pounds, etc. Common sub-units, one-click quick conversion. Base conversion: Supports binary, octal, decimal, and hexadecimal conversions, suitable for electronic/computer engineering scenarios. Specialized engineering calculations: Built-in mechanics, circuits, materials, etc. Modules, solving professional problems such as force on inclined planes, series resistors, etc. User-friendly design: Portrait operation: Compatible with iPhone, using the vertical screen in engineering scenarios is more convenient. Local saved calculation history: Automatically records the last 20 calculations, not lost when uninstalling, and can be recalled at any time. Precise adaptation: Optimized for on-site work by engineers, clear display of large numbers, real-time input verification to avoid errors. Efficient work, time and effort-saving: From basic formulas to complex engineering problems, all are covered, helping you focus on core work!