Calculating Area

Area = Length × Width

Medium

Practice Overview

Description: Learn how to calculate the area of rectangles, understand the area formula, and observe how area changes by adjusting length and width
Estimated Time: 12min
Tags: areacalculationformulalength×widthrectangle
Access Level: Free

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About This Practice

A rectangle’s area needs no cell-by-cell counting: cells per row times number of rows — that is length × width. Change the length and width with + and − buttons and watch the grid, the formula and the area move together, revealing where the formula comes from.

Learn how to calculate the area of rectangles, understand the area formula, and observe how area changes by adjusting length and width

MediumEstimated Time: 12minareacalculationformulalength×widthrectangle

How to Play

Look at the rectangle: how many cells per row, how many rows?
Multiply cells-per-row by rows to get the total.
Match it with the formula length × width — what does each number stand for?
Add 1 to the length and see how the area responds.
Then add 1 to the width — predict first, then check.

Learning Objectives

Understand where “area = length × width” comes from.
Calculate rectangle areas with the formula.
Predict area changes from side changes.

Calculating Area

About This Practice

How to Play

Learning Objectives

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