Teaching double digit addition or double digit subtraction without regrouping? Strategies include place value models, expanded form, part part whole, partial products, number line, counting back, standard algorithm, tens and ones, different ways to solve, and assessments for adding and subtracting two-digit numbers. These 32 activities are ideal for reviewing or introducing the conceptual strategies that allow for easy differentiation and scaffolding. Pre-loaded and ready to use with Seesaw