Mississippi Math 3.MD.7b

Math3rd GradeMeasurement and Data (MD) Solve Problems Involving Measurement and Estimation of Intervals of Time, Liquid Volumes, and Masses of Objects

The Standard

3.MD.7: Relate area to the operations of multiplication and addition.

Multiply side lengths to find areas of rectangles with whole-number side lengths (where factors can be between 1 and 10, inclusively) in the context of solving real-world and mathematical problems, and represent whole-number products as rectangular areas in mathematical reasoning.

2025 Mississippi College- and Career-Readiness Standards for Mathematics · Geometric Measurement: Understand Concepts of Area and Relate Area to Multiplication and to Addition

Teacher's field guide

What This Standard Means

What Students Need to Do: Students multiply whole-number side lengths from 1 to 10 to find the area of a rectangle. They draw rows and columns to show how a rectangle represents a multiplication product.
What Mastery Looks Like: A student can draw a 4 by 6 rectangle on grid paper and label its area as 24 square units. Given 24, they can draw a 3 by 8 rectangle and explain how its rows show the product.
Common Misconceptions: Some students add the side lengths or count only the squares around the edge. Others draw 4 squares plus 6 squares instead of 4 rows of 6, or label an area in units rather than square units.
How to Assess It: Exit ticket: Draw a 3 by 8 rectangle on grid paper. Label its area in square units and write a multiplication equation that matches the drawing.

Lesson moves

Ways to Teach It

Give pairs square tiles to build a 3 by 7 rectangle, then have them count the tiles and write a matching equation.
Ask: Why does a rectangle with 4 rows of 6 squares have an area of 24 square units? Draw and explain.
Have partners draw two cards numbered 1 to 10, sketch the matching rectangle on grid paper, and check each other's area calculations.
Show a floor plan for a rug that is 5 feet by 8 feet, and ask how many square feet it covers.

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