Virginia SOL 3.MG.2.b.i
The Standard
describe and give examples of perimeter as a measurement in contextual situations
Virginia Standards of Learning for Mathematics · The student will use multiple representations to estimate and solve problems, including those in context, involving area and perimeter (in both U.S. Customary and metric units).
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students identify situations where the distance around a shape matters, such as fencing a garden or trimming a bulletin board. They explain what perimeter measures and choose an appropriate linear unit.
What Mastery Looks Like
- A student can identify the boundary of an object or space and explain why someone might measure it. The student names perimeter and uses linear units such as inches, feet, centimeters, or meters.
Common Misconceptions
- Students may confuse the distance around a shape with the space inside it. They may use square units, measure only one side, or include lines inside the boundary.
How to Assess It
- Exit ticket: “A farmer wants to buy fencing for a garden. What measurement does the farmer need, and what part of the garden is measured?”
Lesson moves
Ways to Teach It
Give pairs string and cardboard shapes; students wrap each boundary, cut the string, and compare the lengths.
Ask students to write about one situation where perimeter matters and explain what would be measured.
Use a card sort with situations such as carpeting, fencing, painting, and framing; students sort them into perimeter or not perimeter.
Have students identify where the school uses borders, trim, fencing, or edging, then explain why each requires a perimeter measurement.
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Related Standards
- 5.MG.2.g
Solve contextual problems that involve perimeter, area, and volume in standard units of measure.
- 4.MG.3.f
Solve contextual problems involving area and perimeter of rectangles and squares.
- 3.MG.2.a.i
describe and give examples of area as a measurement in contextual situations; and
- 5.MG.2.c
Describe volume as a measure of capacity and give examples of volume as a measurement in contextual situations.
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