Greatest Common Factor, otherwise known as Greatest Common Divisor, will take an UNLIMITED amount of numbers for input and calculate the GCF of those numbers!

Use spaces, commas or new lines as delimiters for new numbers (how to separate different numbers from each other).
If your keyboard doesn't allow you to type spaces or commas, you'll have to download a different keyboard or use new lines to separate numbers.

Use the 'restore' button to restore the last data you entered before you closed the app the last time.

Long click on the display text, or the numbers you entered and it will bring up the option to copy or paste.

Switch between input screens for the classic GCF screen and the new, unlimited input GCF screen by clicking the options in the top right corner of the app. If you don't have the option in the top right corner, click your Menu BUTTON (which is a physical button on your phone).