https://es.khanacademy.org/

Crear rectángulos con un área dada 1 (3rd grade VERY beginning concept)

https://es.khanacademy.org/math/basic-geo/basic-geo-area-and-perimeter/basic-geo-unit-squares-area/v/creating-rectangles-with-a-given-area-1-math-3rd-grade-khan-academy

Transición de cuadrados unitarios a la fórmula del área

https://es.khanacademy.org/math/basic-geo/basic-geo-area-and-perimeter/area-formula-intuition/v/transitioning-from-counting-t

Utilizar el modelo y propiedades de área para multiplicar

https://es.khanacademy.org/math/cc-fourth-grade-math/cc-4th-mult-div-topic/cc-4th-area-models/v/more-ways-to-think-about-multiplying

Multiplicar con un modelo de área: 78 x 65

https://es.khanacademy.org/math/cc-fourth-grade-math/cc-4th-mult-div-topic/cc-4th-area-models/v/understanding-multiplication-through-area-models

División con modelos de área

https://es.khanacademy.org/math/arithmetic/arith-review-multiply-divide/arith-review-div-pv-area/v/area-models-to-visualize-d