Press on Nerd Scratch Cat when you need to use it as a calculator. Updated 06.06.18 Thanks to @scratching34 for the new suspenders idea! Go check out their projects!
I used the main script from this project, 'How to Make a Scratch Calculator', by @moo_says_cow. I did change the script a little, though, to match my own calculator. Check his/her scratch page out! Here is the link to the project I used the script from: https://scratch.mit.edu/projects/1805475/#player And here is @moo_says_cow's scratch page: https://scratch.mit.edu/users/moo_says_cow/