These review and practice task cards are perfect for reviewing important subject matter at any point during the school year. They are designed for second and third -graders.Why use Basic Concepts: Literacy, Math, Science, Social Studies | Task Cards? Research tells us that children need to frequently review what they’ve been taught in order for the information to go into their long-term memory. These sets of review cards are based on “general knowledge” information for second and third grades. H