The First Grade Standards Edition Unit 3 (Number & Operations Level 3) uses the multi-sensory TouchMath approach to extend previous learning. Hands-on activities and manipulatives are used to increase understanding of place value and its relationship to multiple-digit operations. The use of number lines further strengthens the relationships of numbers. Subtraction is extended through backward counting within 100. Mixed operations are incorporated with problem solving, comparisons, unknowns, TouchPoints, strategies, properties, and relationships.