Calculate Perimeter

Add all the side lengths

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About This Practice

Every side length is labeled — so how do you find the perimeter? Simply add them up. Work it out in your head and pick an answer, or tap “Add step by step” to reveal the partial sums line by line as a check. Wrong picks can be retried, and a correct pick completes the whole equation.

Given the length of every side of a polygon, add them one by one to find the perimeter. Reveal partial sums step by step to check your work, then pick the correct perimeter from three choices.

EasyEstimated Time: 12minperimeter calculationadd side lengthsfind the perimetersum of sidesrepeated addition

How to Play

  1. Read the figure and collect the labeled lengths into one running sum.
  2. Add them up yourself first, then pick from the three options.
  3. Not sure? Tap “Add step by step” and check each partial sum.
  4. On a correct pick, read the complete equation and the final total.
  5. Tap “New Problem” or switch difficulty for shapes with more sides.

Learning Objectives

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