Task# Finding the Area of Polygons

Illustrative MathematicsVaries

The purpose of this instructional task is for students to find the area of figures that can be decomposed and then recomposed into rectyangles. Students can solve parts (a) and (c) simply by using the knowledge described here: 3.MD.6 Measure areas by counting unit squares (square cm, square m, square in, square ft, and improvised units). While students are not expected to add fractions in third grade, they can solve parts (b) and (d) by decomposing the figures and rearranging the triangles with an area of square inch into whole square inches and then finding the area by counting the number of whole square inches.