Practice subitizing with Boom Cards in your kindergarten or first grade classroom. There are 20 cards for students to subitize. Students look at the ten frame(s) and quickly choose how many they see from a multiple choice menu. Sets start at one and go up to 20. Boom Learning is engaging and self-checking. You don't need to check each student's work because it's already done for you! Boom Cards can be played on interactive whiteboards, phones, computers, and tablets. An internet connection is