Find the constant of proportionality (k) from a table, both vertical and horizontal. This set of virtual 20 flash cards give immediate feedback to students and can be assigned through Google Classroom. Boom Cards are great! They are like digital flash cards and give students immediate feedback.To use Boom Cards, you must be connected to the Internet. Boom Cards play on modern browsers (Chrome, Safari, Firefox, and Edge). Apps are available for modern Android, iPads, iPhones, and Kindle Fires. F