FL.MAFS.4.OA. OPERATIONS AND ALGEBRAIC THINKING
MAFS.4.OA.1. Use the four operations with whole numbers to solve problems. (Major Cluster)
MAFS.4.OA.1.1. Interpret a multiplication equation as a comparison, e.g., interpret 35 = 5 × 7 as a statement that 35 is 5 times as many as 7 and 7 times as many as 5. Represent verbal statements of multiplicative comparisons as multiplication equations.
MAFS.4.OA.1.b Determine the unknown whole number in an equation relating four whole numbers using comparative relational thinking. For example, solve 76 + 9 = n + 5 for n by arguing that nine is four more than five, so the unknown number must be four greater than 76.