Do you need engaging math lessons and activities to teach Addition Strategies in first grade? This 1st grade addition within 20 guided math unit includes lesson slides, hands-on activities, math centers, worksheets, addition strategy posters, and assessment. Strategies include making a model, number bonds, using a number line to add, counting on, doubles, doubles + 1, friends of ten, and more! Teaching addition strategies in first grade is so important for developing fact fluency and helping stu