Florida B.E.S.T. MA.2.GR.2.2
The Standard
Find the perimeter of a polygon with whole-number side lengths. Polygons are limited to triangles, rectangles, squares and pentagons.
Florida B.E.S.T. Standards for Mathematics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students trace the boundary of a polygon and add the length of each side once. They record the total with the correct length unit.
What Mastery Looks Like
- Students trace the outside edge, include each side once, and add accurately. They can explain their equation and label the answer with the correct unit.
Common Misconceptions
- Students may count corners, add only the labeled sides, or confuse perimeter with area. They may also forget to include units or double only one pair of rectangle sides.
How to Assess It
- Give a pentagon with side lengths 3, 4, 2, 5, and 3 inches. Ask students to show an addition equation and state the perimeter with units.
Lesson moves
Ways to Teach It
Build triangles, rectangles, squares, and pentagons with labeled craft sticks, then add the side lengths around each shape.
Ask students to explain why a rectangle with sides 3, 5, 3, and 5 has a perimeter of 16 units.
Play Perimeter Match by pairing polygon cards with addition equations and perimeter cards.
Give students a garden plan with labeled sides and ask how much fencing is needed to surround it.
Keep exploring
Related Standards
- MA.912.GR.5.4
Construct a regular polygon inscribed in a circle. Regular polygons are limited to triangles, quadrilaterals and hexagons.
- MA.2.GR.2.1
Explore perimeter as an attribute of a figure by placing unit segments along the boundary without gaps or overlaps. Find perimeters of rectangles by counting un...
- MA.4.GR.2.1
Solve perimeter and area mathematical and real-world problems, including problems with unknown sides, for rectangles with whole-number side lengths.
- MA.2.GR.2
Describe perimeter and find the perimeter of polygons.
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