1. After entering the memo, click on the blank space and start typing. After clicking, the following keyboard will be displayed, and then click the "123" key in the lower left corner. Click the "123" key in the lower left corner, and the keyboard will become as shown in the figure, then click the "#+=" key in the lower left corner.

2. First open the "Memo" of AppleiPad and create a new memo, as shown in the figure below. Secondly, after completing the above steps, enter the memo, click the blank and start to enter the text, as shown in the figure below. Then, after clicking, the following keyboard will be displayed.

3, ipad hits the percentage sign method. Download and install sogou input method. You can see it in the lower right corner of the desktop after downloading. Click the keyboard icon and select the special symbol to enter. In the symbol encyclopedia, select the mathematical unit. Drop down, find the percent sign, and click Finish Input.

4. Use built-in symbols or expressions: In the process of typing, you can try to use the symbols or expressions built into the tablet computer, for example, enter "arrow" or "→" in the input box to see if there are any corresponding symbols or expressions available.

5. Using the hidden symbols in the input keyboard is relatively simple-switch the input method to the English keyboard, press and hold a key on the keyboard, the hidden similarity will pop up, and then select it. The other is to add input methods in other languages.