Depending on the size of your screen you may have to click the Data button first. Select the Insert tab on the ribbon. The keyboard shortcut is alt.
You can type in the Formula box select a number format from the Number Format list and paste in functions and bookmarks using the Paste Function and Paste Bookmark lists.
You can use this online keyboard in alternation with your physical keyboard for example you can type regular numbers and letters on your keyboard and use the virtual math keyboard to type the mathematical characters. Its easier if youre in Words equation editor math mode Alt enters math mode where you can just type symbol names like omega and times. Select the Insert tab on the ribbon. Find the Equation icon p.