Unit 2-Explore Multiplicative Comparisons, Factors & Multiples, and Area & Perimeter
Cluster 2-Explore Multiplicative Comparisons, Factors & Multiples, and Area & Perimeter
The work in this cluster builds off the 3rd grade focus of multiplication as repeated addition and equal groups and includes the new interpretation in 4th grade of multiplication as comparison. In fourth grade, students continue to develop the concept of area based on the array model and use that model to explore factors and multiples.
Learning Objectives:
4.OA.1 Interpret a multiplication equation as a comparison. Multiply or divide to solve word problems involving multiplicative comparisons using models and equations with a symbol for the unknown number. Distinguish multiplicative comparison from additive comparison. (ongoing)
4.OA.3 Solve two-step word problems involving the four operations with whole numbers. Use estimation strategies to assess the reasonableness of answers. Represent problems using equations with a letter standing for an unknown quantity. (ongoing)
4.OA.4 Find all factor pairs for whole numbers up to and including 50. Recognize that a whole number is a multiple of each of its factors. Determine whether a given whole number is a multiple of a given one-digit number. Determine whether a given whole number is prime or composite.
4.MD.3 Find the areas of rectilinear figures with known side lengths. Solve problems involving a fixed area and varying perimeters and a fixed perimeter and varying areas. Apply the area and perimeter formulas for rectangles in real world and mathematical problems.
The work in this cluster builds off the 3rd grade focus of multiplication as repeated addition and equal groups and includes the new interpretation in 4th grade of multiplication as comparison. In fourth grade, students continue to develop the concept of area based on the array model and use that model to explore factors and multiples.
Learning Objectives:
4.OA.1 Interpret a multiplication equation as a comparison. Multiply or divide to solve word problems involving multiplicative comparisons using models and equations with a symbol for the unknown number. Distinguish multiplicative comparison from additive comparison. (ongoing)
4.OA.3 Solve two-step word problems involving the four operations with whole numbers. Use estimation strategies to assess the reasonableness of answers. Represent problems using equations with a letter standing for an unknown quantity. (ongoing)
4.OA.4 Find all factor pairs for whole numbers up to and including 50. Recognize that a whole number is a multiple of each of its factors. Determine whether a given whole number is a multiple of a given one-digit number. Determine whether a given whole number is prime or composite.
4.MD.3 Find the areas of rectilinear figures with known side lengths. Solve problems involving a fixed area and varying perimeters and a fixed perimeter and varying areas. Apply the area and perimeter formulas for rectangles in real world and mathematical problems.
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