A focused Grade 3 learning session for Area by Multiplying Side Lengths using visual models, worked examples, strategy guidance, and a short mastery check.
Student goal: I can multiply side lengths to find the area of a rectangle.
Area by Multiplying Side Lengths means measuring how much flat space a figure covers by using equal-sized square units.
Question: A rectangular rug is \(6\) meters long and \(4\) meters wide. What is the area of the rug?
Why it works: Area \(=\) length \(\times\) width \(=6\times4=24\) square meters. Choice A (10) is the sum; C (20) is 4×5 miscomputation; D (12) is 6×2.
Answer: \(24\) sq m
Question: Find the area of the rectangle shown above.
Answer: \(8\) sq cm
Question: Lily is building a sandbox for her backyard. The sandbox is \(8\) feet long and \(6\) feet wide. What is the area of the sandbox?
Answer: \(48\) sq ft
Question: A garden is \(7\) feet long and \(5\) feet wide. What is its area?
Why it works: Area \(=\) length \(\times\) width \(=7\times5=35\) square feet. Choice A (12) is the sum \(7+5\); Choice C (24) is common product error; Choice D (70) is double the area.
Answer: \(35\) sq ft
Area by Multiplying Side Lengths becomes easier when students connect the question to a model, use clear steps, and explain why the answer fits.
Area means every square unit inside the figure.
Use scratch paper. The explanation matters more than simply seeing whether the choice is correct.
A garden is \(7\) feet long and \(5\) feet wide. What is its area?
Answer B: \(35\) sq ft
Area \(=\) length \(\times\) width \(=7\times5=35\) square feet. Choice A (12) is the sum \(7+5\); Choice C (24) is common product error; Choice D (70) is double the area.
A rectangular rug is \(6\) meters long and \(4\) meters wide. What is the area of the rug?
Answer B: \(24\) sq m
Area \(=\) length \(\times\) width \(=6\times4=24\) square meters. Choice A (10) is the sum; C (20) is 4×5 miscomputation; D (12) is 6×2.
A classroom floor is shaped like a rectangle with a length of \(9\) feet and a width of \(8\) feet. What is the area of the classroom floor?
Answer B: \(72\) sq ft
Area \(=\) length \(\times\) width \(=9\times8=72\) square feet. Choice A (17) is the sum; C (64) is \(8\times8\); D (63) is \(9\times7\).
What is the area of this rectangle?
Answer B: \(15\) sq in
Area \(=\) length \(\times\) width \(=5\times3=15\) square inches. Choice A (8) is the sum; C (10) is \(5\times2\); D (12) is \(4\times3\).
Sam needs to paint a poster that is \(10\) inches wide and \(8\) inches tall. What is the total area Sam needs to paint?
Answer B: \(80\) sq in
Area \(=\) width \(\times\) height \(=10\times8=80\) square inches.
Find the area of the rectangle shown above.
Answer B: \(8\) sq cm
Area \(=\) length \(\times\) width \(=4\times2=8\) square centimeters. Choice A (6) is the sum; C (4) is one dimension; D (12) is \(4\times3\).
A rectangular tile is \(7\) inches long and \(3\) inches wide. How much area does one tile cover?
Answer C: \(21\) sq in
Area \(=\) length \(\times\) width \(=7\times3=21\) square inches.
Lily is building a sandbox for her backyard. The sandbox is \(8\) feet long and \(6\) feet wide. What is the area of the sandbox?
Answer A: \(48\) sq ft
Area \(=\) length \(\times\) width \(=8\times6=48\) square feet.
A rectangular parking spot measures \(6\) meters by \(4\) meters. What is its area?
Answer D: \(24\) sq m
Area \(=\) length \(\times\) width \(=6\times4=24\) square meters.
Noah is making a rectangular picture frame. The frame is \(9\) inches wide and \(7\) inches tall. What is the area inside the frame?
Answer D: \(63\) sq in
Area \(=\) width \(\times\) height \(=9\times7=63\) square inches.
What is the area of the rectangle shown?
Answer D: \(10\) sq cm
Area \(=\) length \(\times\) width \(=5\times2=10\) square centimeters.
