--- title: "Rectangle area by multiplying" description: "Multiply side lengths to find areas of rectangles and represent whole-number products as rectangular areas" canonical: https://lightmysky.com/learn/mathematics/rectangle-area-by-multiplying-mt_GzcJEVkNRn source: https://lightmysky.com/learn/mathematics/rectangle-area-by-multiplying-mt_GzcJEVkNRn.md retrieved: 2026-10-19 --- > **Agent view.** This is the Markdown twin of the page, for tools and assistants. > When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md > API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md > Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt > Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json > Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`. # Rectangle area by multiplying Multiply side lengths to find areas of rectangles and represent whole-number products as rectangular areas Subject: Mathematics · Area: Measurement · Ages 8 to 9 Page: https://lightmysky.com/learn/mathematics/rectangle-area-by-multiplying-mt_GzcJEVkNRn ## Ready when they can - Calculate the area of a 7 cm × 9 cm rectangle as 63 cm² - Draw a rectangle with area 36 square units and label its side lengths - Solve: A garden is 8 m by 5 m — what is its area? ## Lesson: Multiplying to find area You already know how to find area by counting unit squares one at a time. There is a faster way. If you know the length and the width of a rectangle, you can multiply them to get the area right away. *(drawing: This rectangle has 4 rows and 6 columns. Instead of counting all 24 squares, multiply: 4 × 6 = 24.)* **Example.** A rectangle is 7 cm by 9 cm. Multiply the side lengths: 7 × 9 = 63. The area is 63 square centimeters, written as 63 cm². **Tip.** Always write the unit name after the number, like cm² or m². The small 2 means the squares fit inside the shape, not just a length measured across. **Recap.** To find area, multiply the two side lengths and label the answer in square units, like cm² or m². ## Practice 18 questions on this page, each with its working shown. ## Needs first - [Area by Tiling](https://lightmysky.com/learn/mathematics/area-by-tiling-mt_Jvvh5P06NV) ## Opens up - [Generalising from repeated reasoning](https://lightmysky.com/learn/mathematics/generalising-from-repeated-reasoning-mt_aivrWs6jrS) - [Area and the distributive property](https://lightmysky.com/learn/mathematics/area-and-the-distributive-property-mt_AQo4u7O4sM) - [Area and perimeter of rectangles](https://lightmysky.com/learn/mathematics/area-and-perimeter-of-rectangles-mt_eiB3-6pu6a) - [Area of compound shapes](https://lightmysky.com/learn/mathematics/area-of-compound-shapes-mt_eMtV6tBSJm) - [Modelling with multiplication and fractions](https://lightmysky.com/learn/mathematics/modelling-with-multiplication-and-fractions-mt_K3R0yaHVcx) - [Perimeters of polygons](https://lightmysky.com/learn/mathematics/perimeters-of-polygons-mt_WtcFrxGOgw)