Why not start from the beginning of this contextual 5-day unit of real world lessons from the Make Math Moments Problem Based Units page. Three (3) additional number talk prompts are available in Day 2 of the Grass is Greener problem based math unit that you can dive into now. For the rectangle mentioned above, the perimeter 10 + 20. how much fence is needed to go around the rectangle). The perimeter is found by adding all of the sides together (i.e. a rectangle of 10 meters by 20 meters would have an area of 10 x 20 200 m 2. Want to Explore These Concepts & Skills Further? For any rectangle, the area is calculated by multiplying the length by the width e.g. Regardless of the strategy or strategies used by students, we hope all students are able to articulate that the area of this rectangle is 40 square units or 40 units-squared. In this case, they are squares.Īlthough some students may choose to count each square 1-to-1, some students may recognize the pattern of rows and columns (an array) and use them to help make counting easier by skip counting.Īt this point, we want to ensure we highlight student strategies such as one-to-one counting and skip counting and explicitly connect the skip counting strategies by rows and/or columns as a multiplication sentence.įor students that counted by rows, we can see that there were 5 rows of 8 units per row.įor students counting by columns, we can highlight that there are 8 columns of 5 units per column. The goal with the first visual number talk prompt in this string of problems is to ensure that students are understanding that determining a quantity of area involves counting 2-dimensional units. ![]() If a student uses multiplication, write the multiplication sentence. For example, if a student uses repeated addition, write the addition sentence on the board. Some examples of rectangular shapes are the flat surfaces of laptop monitors, blackboards, painting canvas, etc. ![]() In other words, the space occupied by a rectangle is the area of the rectangle. Represent the student thinking symbolically. The area of a rectangle is the number of unit squares that can fit into a rectangle. Students are asked to calculate the area of each rectangle in square units. Present the following rectangles one at a time. The array replaces the need to count individual units and makes it possible to calculate an area. In this case, it will be 2 × 3 6 square units. Thus, the formula for the area of a rectangle is: Area of the rectangle length × width. The area of a rectangle is obtained by multiplying its length and width which is the same as counting the unit squares. ![]() Students will continue exploring the relationship between the area of rectangles and the array model. In the above example, the length of the rectangle is 3 units and the width is 2 units. To find the area of a rectangle or a square you need to multiply the length and the width of a rectangle or a. In This Set of Visual Number Talk Prompts… The area is measurement of the surface of a shape. Visual Number Talk to emerge and build an understanding of the relationship between the area of a rectangle and the array model.
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