Calculating and Pasting the Result of a Formula in a Text Document
If your text already contains a formula, for example "12+24*2", LibreOffice can calculate, and then paste the result of the formula in your document, without using the Formula Bar.

पाठ में सूत्र को चुनें. सूत्र में सिर्फ संख्या तथा ऑपरेटर्स हो सकते हैं तथा स्पेस नहीं हों.

Choose Tools  Calculate, or press Command Ctrl+Plus Sign (+).

Place the cursor where you want to insert the result of the formula, and then choose Command Ctrl+V.
, or press
The selected formula is replaced by the result.