This packet includes many activities about the number 100. Students find missing addends, work with the 100s chart, find number patterns that make 100, and problem solve with $1.00. All the activities are differentiated. Answer sheets are included. While the activities best fit a first and second grade CCSS standards, there are many great reinforcement activities for third graders too!! Use this as part of a 100 study or for your 100 day celebration!