MRS BARBER HOMESCHOOL GRADE 1 AND 2 MATHEMATICS Through their learning in the Operations and Algebraic Thinking domain, students: • develop strategies for adding and subtracting whole numbers based on their prior work with small numbers; • use a variety of models, including discrete objects and length-based models (e.g., cubes connected to form lengths), to model add-to, take-from, put-together, take apart, and compare situations to develop meaning for the operations of addition and