These exit slips can be used after any lesson for any subject to check understanding! I edited them in Excel so they are easily editable for you. There are two on a page so they can be cut in half.
Have students fill out their name and date and the objective of the lesson at the beginning of the lesson. After the lesson, have students check the box on whether they understood, didn't understand, or need more practice. Have students explain why they did/didn't get it and demonstrate what they learned from the lesson.
They might look weird in the preview, but when I print them out, it prints 2 on a page.