This is the ninth module in a set of 10 for first grade. In this module students practice continue to practice addition and subtraction strategies with 2-digit numbers. Student use ten sticks, base ten blocks, number lines, coins, and number bonds to help demonstrate strategies. There are 16 lessons in this module. There is also a fluency activity for each lesson. Each lesson should take about 10 minutes.The final lesson is a review of all the content covered in the module.This is a great resour