This is a collection of lessons created to address the 4.NBT.3 common core standard for fourth grade. The lessons include: **Strategies for rounding to the nearest 10, 100, 1,000, 10,000, and 100,000. **Rounding first, then performing the operation. **Rounding word problems. Multi-step word problems are included as warm-ups and cool-downs. There are 79 slides in this file, which should last you approximately one week. The practice problems at the end of each session/lesson included can be use