Mathematics | Grade : 3
Domain - Measurement and Data
Cluster - Geometric measurement: understand concepts of area and relate area to multiplication and to addition.
[3.MD.C.7.d] - Recognize area as additive. Find areas of rectilinear figures by decomposing them into non-overlapping rectangles and adding the areas of the non-overlapping parts, applying this technique to solve real-world problems.
[3.OA.D.8] -
Solve two-step word problems using the four operations for problems posed with whole numbers and having whole number answers. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies, including rounding. [Note: Students should know how to perform operations in the conventional order when there are no parentheses to specify a particular order (Order of Operations)]
[3.MD.C.5] -
Recognize area as an attribute of plane figures and understand concepts of area measurement.
[3.MD.C.7.c] -
Use tiling to show in a concrete case that the area of a rectangle with whole-number side lengths a and b + c is the sum of a x b and a x c. Use area models to represent the distributive property in mathematical reasoning.