This is a slideshow to practice MClass missing numbers. It includes every possible missing number problem 1-20. Start the slideshow and it will change every 3 seconds. The first slide shows a missing number, then the next slide shows the answer. You can have students say the answer or write it on a dry erase board. I made this for my own use and decided to share-so you will need to download a free font in order for it to appear correctly. The link is included on the title page.