Worked Example 1
Using the Formula
A rectangle is 7 feet long and 9 feet wide. What is its area?
- 1Area = length × width
- 27 × 9 = 63
Answer: 63 square feet
Florida Grade 3 Math · Geometric Reasoning
MA.3.GR.2.2: Area of Rectangles
What this Grade 3 benchmark means, worked examples, common mistakes, and a free printable worksheet.
Created by a Florida mom · Published by Tropical Learning LLC
What Is Benchmark MA.3.GR.2.2?
Students find the area of a rectangle with whole-number side lengths using a visual model (unit squares or an array) and the multiplication formula: area = length × width.
Each row of unit squares has as many squares as the length, and there are as many rows as the width. That is why multiplying works. Answers use square units.
Official benchmarkFind the area of a rectangle with whole-number side lengths using a visual model and a multiplication formula.
On the FAST test: part of the Grade 3 reporting category Number Sense and Multiplicative Reasoning, which is about 23–29% of the test.
Worked Examples
Worked Example 2
Real-World Area
A rug is 8 meters long and 6 meters wide. How much floor does it cover?
- 1The rug covers 6 rows of 8 square meters.
- 28 × 6 = 48
Answer: 48 square meters
Common Mistakes to Watch For
Adding the sides
Wrong:A rectangle 6 inches by 4 inches has an area of 6 + 4 = 10 square inches.
Area is rows times squares in each row: 6 × 4 = 24 square inches.
Finding the perimeter instead
Wrong:A rectangle 2 units by 9 units: 2 + 9 + 2 + 9 = 22 square units.
That is the distance around. Area is 2 × 9 = 18 square units.
Helpful Math Tip
Draw the rectangle on grid paper and count a few rows to see why length × width works, then use the formula.
Related Grade 3 Skills
Make Florida Math Practice More Fun
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Start Practicing FreeIndependent Educational Platform. FastChomp is published by Tropical Learning LLC and is not affiliated with, sponsored by, or endorsed by the Florida Department of Education. FAST and Star assessment names are referenced for informational purposes only. FastChomp practice questions are original educational materials, not official Florida FAST assessment questions.