Students can use these cards to match-up teen numbers in the form of numerals, base ten/MABs, and words. Structure as an individual or group activity. Perfect for math rotations! Introduce concrete materials to this activity to increase engagement further, for example build the teen number using unifix cubes, wooden sticks, counters or bead string. You can use these cards as a math warm up, hand a card to each student and set your timer, allow students to wander the room to find their match.