This manual is for students who may have memorized some addition facts, but are not fluent in addition facts with sums between 10 and 20, do not show an understanding of addition and its relation to subtraction, or have enough number knowledge or flexibility to solve unknown addition problems.

Learn More

Please note that professional development, coaching, and infrastructure support are essential components to effective implementation of SIM instructional tools and interventions. It is highly recommended that you work with a SIM professional developer.