＝ mini app for iPhone and iPad

Please refer to this app and the calculation method as "Equal calculation (machine)".
As the call shows, the "=" button, which is familiar with the calculator, is in the center of the screen. But there is no "+－×÷" button anywhere.

The calculator is very useful, but if you make a mistake in the numbers and the "+－×÷" buttons, you have to re-do everything. Or will you be typing the same value over and over again in a similar calculation? The new method that saves such a trouble is "Equal calculation".
This app is one of the patent application examples. It is an easy-to-use interface for people who are familiar with the iPhone keypad operation. Because it is simple, "mini" is attached to the app name.

Use。
(1) Please refer to the screenshot. In the description here, each part is called the "=" (equal) button, "Mountain value", "Number frame", "Answer frame", "▼" (triangular) button, and "Drum".
(2) First, lets turn the "Drum" on the bottom of the screen, and take a look at some examples of how the arithmetic calculation can be done, and what practical calculations can be done.
(3) Tap the "Number frame" line on the top of the screen to display the numeric keypad. (The numeric keypad may take a long time to appear) change the number on the numeric keypad, then press the "=" button to get the result of the calculation in the "Answer frame".
(4) Once you tap the "Answer frame", and then tap the other "Number frame", you can make the location of the "Answer frame", you can easily backwards the calculation formula.
(5) Tap the "▼" button to display the "Drum".
(6) Select "All Clear" at the top of the "Drum" if you want to erase all the numbers in the “Number frame" at once.

- Addition : "Mountain values" and "Mountain values" are combined together.
- Multiplication : A value multiplied by the number of stacked in one mountain is the value in the mountain.
In this way, we will determine the addition and multiplication of the number of ways and stacking.
So how do you think subtraction is calculated? In subtraction, the addition of [ “subtract" + "answer" = "number of original" ] is established. So,
- Subtraction : On the side with the "Answer frame" of the left and right across the "=", to make addition to the "Mountain value".
And do you think division can be calculated? In division, the multiplication of [ “number" x "answer" = "original number" ] is established. So,
- Division : Put the number in the "Number frame" superimposed on the "Answer frame" to the multiplication in the "Mountain value".

In other words, subtraction is replaced by the form "add to answer", because the division is replaced by the form of "multiply by answer", arithmetic calculation consists of considering only the addition (mountain line) and multiplication (piled up in the mountain). Then, the "+－×÷" button becomes unnecessary, and the "=" button is used now. This is "Equal calculation".

Notes when using the iPad.
- The keyboard of the numpad type to handle on the iPhone is not included in the iPad, so substitute the number and sign keyboard.

Decisions and promises.
- Compared to conventional calculators, there are various differences in computational functions, so if you use them for important computational tasks, check the verification calculation beforehand.
- There is a difference and a fault compared with a conventional computer, and an unexpected problem can be generated. If any damage is caused by them, the producer and seller are not responsible.
- The method used in this application is currently pending patent application. For those who are considering a similar method, please respond to industrial property rights after confirming the information disclosure of the year 2019.
- Because it is a calculation method which is not learnt in the elementary school, please refrain from the question to the teacher who seems not to be interested.