A resource of minilessons using strings of related problems for addition and subtraction. Once the open number line has been introduced with Measuring for the Art Show, start using this resource to support the development of strategies for addition and subtraction to 100 and beyond. The second half of this unit is used in Grade 2. In Grade 3 use as needed to strengthen addition and subtraction strategies within 1000. It’s also a helpful resource for work with small guided groups. Use this as a resource in the fall to do computation work every day as needed and then go to the minilessons for early multiplication resource.