This fun and differentiated JAM-PACKED unit is filled with 215 pages of everything you need to teach adding 3 numbers (with sums to 20) in first grade. (Link to REAL PICTURES & fun ideas to teach in description!) This pack covers 4 main standards/concepts: adding 3 numbers, strategies for adding 3 numbers (ten frames, make a 10, find a double, and number lines), word problems, and missing addends with 3 numbers. There is a lot of stuff in here!This massive unit has 73 differentiated workshee