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Commutative Property of Multiplication | MathHelp.com

By MathHelp.com

This lesson covers the properties of a rhombus. Students learn the definitions of a rectangle, a rhombus, and a square. Students also learn the following theorems. The diagonals of a rectangle are congruent. The diagonals of a rhombus are perpendicular and bisect the angles of the rhombus. The midpoint of the hypotenuse of a right triangle is equidistant from the three vertices. Students are then asked to solve problems related to these concepts using Algebra.

Area of rectangles and rectangular shapes. Concrete case of the distributive property (3.MD.7.c)

By Math Mammoth

Area of rectangles can be found by multiplication. In my example rectangle, we count the rows and columns, and then write a multiplication to find the area (5 x 3 = 15 squares).