South Carolina Standards & Learning
SC.4.NSBT. Number Sense and Base Ten
4.NSBT.4. Fluently add and subtract multi-digit whole numbers using strategies to include a standard algorithm.
4.NSBT.5. Multiply up to a four-digit number by a one-digit number and multiply a two-digit number by a two-digit number using strategies based on place value and the properties of operations. Illustrate and explain the calculation by using rectangular arrays, area models and/or equations.