Math The SIM math strategies cover everything from addition to division. They use a concrete-representational-abstract method of instruction to help students master math. Multiplication with Regrouping: Partial Products Multiplication with Regrouping: Standard Algorithm Addition Facts 0 to 9 Addition Within 20 Addition Facts 10 to 18 Addition with Regrouping Division Facts 0 to 81 Multiplication Facts 0 to 81 Place Value: Discovering Tens and Ones Subtraction Facts 0 to 9 Subtraction Facts 10 to 18 Subtraction with Regrouping Learn more about the Institute for Strategic Math Instruction (ISMI) at the University of Kansas Center for Research on Learning