Testinar Grade 3 math

Area via Multiplication and Addition

Students will connect rectangular area to multiplication and addition.

CH06-05 Geometry and Measurement

Directions Solve each problem. Show your reasoning on the page or on separate paper. Check the answer key only after finishing.

A rectangle has length \(6\) units and width \(3\) units. What is its area?
1. \(9\) sq units
2. \(12\) sq units
3. \(18\) sq units
4. \(36\) sq units
A square has side length \(4\) cm. What is the area of the square?
1. \(8\) sq cm
2. \(12\) sq cm
3. \(16\) sq cm
4. \(20\) sq cm
Which rectangle has an area of \(12\) square units?
1. length \(2\), width \(6\)
2. length \(3\), width \(5\)
3. length \(4\), width \(4\)
4. length \(2\), width \(5\)
A rectangle has a length of \(5\) meters and a width of \(2\) meters. Find the area.
1. \(7\) sq meters
2. \(10\) sq meters
3. \(14\) sq meters
4. \(25\) sq meters
What is the area of the rectangle?
1. \(7\) sq units
2. \(12\) sq units
3. \(14\) sq units
4. \(24\) sq units
A rectangle has area \(20\) square feet. Its length is \(5\) feet. What is its width?
1. \(3\) feet
2. \(4\) feet
3. \(5\) feet
4. \(15\) feet
How many unit squares fit in this rectangle?
1. \(7\) units
2. \(9\) units
3. \(15\) units
4. \(10\) units
A rectangle has length \(6\) units and width \(2\) units. It has \(6\) rows with \(2\) unit squares in each row. Using repeated addition: \(2 + 2 + 2 + 2 + 2 + 2 =\) ?
1. \(8\) sq units
2. \(12\) sq units
3. \(10\) sq units
4. \(14\) sq units

Teacher and parent reference

Answer key and explanations

C. \(18\) sq units
Area \(= 6 \times 3 = 18\) square units. You can also count by adding: \(3 + 3 + 3 + 3 + 3 + 3 = 18\) (six rows of three units each).
C. \(16\) sq cm
A square is a rectangle with equal sides. Area \(= 4 \times 4 = 16\) square cm.
A. length \(2\), width \(6\)
Choice A: \(2 \times 6 = 12\) ✓. Choice B: \(3 \times 5 = 15\). Choice C: \(4 \times 4 = 16\). Choice D: \(2 \times 5 = 10\).
B. \(10\) sq meters
Area \(= 5 \times 2 = 10\) square meters. This is \(5\) rows of \(2\) unit squares (or \(2 + 2 + 2 + 2 + 2 = 10\)).
B. \(12\) sq units
The diagram shows length \(4\) and width \(3\). Area \(= 4 \times 3 = 12\) square units. You can also add: \(3 + 3 + 3 + 3 = 12\) (four rows of three).
B. \(4\) feet
Area \(= \text{length} \times \text{width}\). So \(20 = 5 \times \text{width}\). Width \(= 20 \div 5 = 4\) feet.
D. \(10\) units
The grid shows 5 columns and 2 rows. Area \(= 5 \times 2 = 10\) square units. You can also count: \(5 + 5 = 10\) (two rows of five).
B. \(12\) sq units
Adding the width \(2\) six times: \(2 + 2 + 2 + 2 + 2 + 2 = 12\). This is the same as \(6 \times 2 = 12\) square units.