Description: Explanations and examples of how to implement the Operations & Algebraic Thinking standards in Grade 2. In the first problem, the product is unknown; students need to multiply 12 by 6 to find the total. In the second problem, the multiplier (or "scale factor") is unknown; students can use division to solve this problem (45 ÷ 15 = ?) In the third problem, the smaller amount is unknown; students can use division to solve this problem (45 ÷ 3 = ?). In addition to understanding this new meaning of multiplication, in Grade 4 students continue to solve word problems involving equal groups, arrays, and area, like they did in Grade 3.*Teacher Advisor is 100% free.