- Great for online and distance learning! Created to be compatible with Google Slides™!-In this interactive curriculum, students will test their skills and application comprehension with all topics of Pre-Algebra! This curriculum is no prep, paperless, easy to grade, and fun interactive experience!- Includes all 7 of the units below with 68 different activities and over 1,500 problems! Purchase it once and you'll always be able to re-download when there are new additions.The Number System - Unit