Skill: Find area of rectangles using multiplication

A rectangle’s area measures the number of equal-sized square units covering its interior and can be found by multiplying its side lengths: $A = \text{length} \times \text{width}$. An array of equal rows and columns represents this relationship and helps distinguish area from perimeter; the treatment is limited to rectangles with whole-number dimensions and does not include fractional or decimal side lengths, algebraic generalization, or more complex regions.