This Interactive and Paperless, Digital Interval Notation Match Up Activity with Google™ Slides is great practice for this important topic and will build fluency for this topic. Students sort and match 18 puzzle pieces on each of three slides, matching Interval Notation in three formats: Graphing, Variable notation, such as 3 < x < 18, and Parentheses bracket notations such as (3, 18]. Use all the slides now, or give them to your students one at a time. There are 18 problems, 54 pieces.