Rectangle Area Formula

Area of a rectangle is length times width

Loading...

About This Practice

Why is a rectangle’s area “length × width”? Add or remove rows and columns with the buttons and watch the total follow: one more row adds a whole row of squares, one more column adds a whole column. Once you have played with it, the formula surfaces on its own — counting rows × columns is exactly length × width.

Add or remove rows and columns of a rectangle and watch the total-squares equation update in sync. Discover there is no need to count one by one: rows times columns (length times width) gives the area.

MediumEstimated Time: 12minrectangle area formulalength times widthrows and columnsarea formulaarea of a rectangle

How to Play

  1. Count the rectangle: how many rows, how many columns, how many squares in all?
  2. Tap “+ rows” or “+ cols” and see how much the highlighted new row or column adds.
  3. Match it with the equation: rows × columns = total squares.
  4. After adjusting, read the formula: area of a rectangle = length × width.
  5. Tap “New Rectangle” or switch difficulty and verify with bigger ones.

Learning Objectives

More Practices in This Theme

Related Themes for This Grade