Worked Example 1
Perimeter of a Triangle
A triangle has sides of 8 centimeters, 11 centimeters, and 6 centimeters. What is its perimeter?
- 1Add all three sides: 8 + 11 + 6 = 25
Answer: 25 centimeters
Florida Grade 2 Math · Geometric Reasoning
MA.2.GR.2.2: Perimeter of Polygons
What this Grade 2 benchmark means, worked examples, common mistakes, and a free printable worksheet.
Created by a Florida mom · Published by Tropical Learning LLC
What Is Benchmark MA.2.GR.2.2?
Students find the perimeter of triangles, rectangles, squares, and pentagons with whole-number side lengths by adding the lengths of all the sides. Perimeters are 100 units or less.
No formula is needed in Grade 2. Students can add the sides in any order to make it easier, and answers include the unit, such as inches or meters.
Official benchmarkFind the perimeter of a polygon with whole-number side lengths. Polygons are limited to triangles, rectangles, squares and pentagons.
How it is tested: Grade 2 students take FAST Star Math, Florida's math test for Kindergarten through Grade 2.
Worked Examples
Worked Example 2
Adding in a Friendly Order
A rectangle is 17 feet long and 13 feet wide. What is its perimeter?
- 1A rectangle has two sides of 17 feet and two sides of 13 feet.
- 2Group a 17 and a 13 to make a ten: 17 + 13 = 30
- 3Do it again for the other pair: 30 + 30 = 60
Answer: 60 feet
Common Mistakes to Watch For
Adding only the sides that are labeled
Wrong:A rectangle labeled 12 m and 5 m: 12 + 5 = 17 m
Opposite sides of a rectangle are the same length. Add all four sides: 12 + 5 + 12 + 5 = 34 meters.
Leaving off the unit
Wrong:The perimeter is 34.
Say what the number measures: 34 meters.
Helpful Math Tip
Have your child measure the sides of a book or a placemat with a ruler, then add the sides to find the perimeter.
Related Grade 2 Skills
Make Florida Math Practice More Fun
Help your child build math confidence with original interactive questions aligned with Florida's B.E.S.T. Mathematics Standards.
Start Practicing FreeIndependent Educational Platform. FastChomp is published by Tropical Learning LLC and is not affiliated with, sponsored by, or endorsed by the Florida Department of Education. FAST and Star assessment names are referenced for informational purposes only. FastChomp practice questions are original educational materials, not official Florida FAST assessment questions.