hi, I'm new, I would like to calculate 4 textboxes where I have to insert numbers in each textbox, and infinitely give me a result, I need this how much time is left to finish a production, the calculation is this: text1x text2 x text3 / text4 / 60.
Thank you
Welcome.
Use the Math blocks ... Math blocks
Perhaps
Fill the TextBoxes with values and run the app to see if it provides the correct answer. 
Edit: an earlier example was wrong. You need to test the Blocks using values to be sure you constructed the blocks the correct way. 
What have you tried?
Here are some resources to help you learn to use the AI2 tools. A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook App Inventor 2 Book: Create Your Own Android Apps ... the links are at the bottom of the Web page. The book 'teaches' users how to program with AI2 blocks.
There is a free programming course here Course In A Box and the aia files for the projects in the book are here: App Inventor 2 Book: Create Your Own Android Apps
How to do a lot of basic things with App Inventor are described here: How do you...? .
Also look here App inventor español. Offline. Tutorial. Ejemplos. Instalación. Códigos. Juegos. Curso gratis de App inventor. and here Tutorials for more tutorials
Learn about components Component Reference
and visit the Library The MIT App Inventor Library: Documentation & Support Help>Library on the MENU
Thanks SteveJ! rereading my post, I noticed that I didn't put the example button (calculate) and a label that shows me the result, Thanks again I'll try tomorrow.
