The Second Grade Standards Edition Unit 2 (Addition & Subtraction Level 2) use manipulatives, models, place value charts, visual cues, and TouchPoints to extend understanding of addition and subtraction withing 100, and expand place value through the thousands. These complex concepts are broken down in small, achievable steps. Problem solving strategies are introduced including draw a picture, use of manipulatives, finding patterns, using tables, and identifying extra information. Fluency with basic facts is continuing in development.