Math With Mr DJ

Grade 7 · Geometry · 7.G.B.6

Surface Area of Prisms Worksheets

Free, printable, and ready to teach: a practice worksheet, homework, an exit ticket, and an answer key with step-by-step solutions — plus lesson slides you can edit. No sign-up needed.

First page of the surface area of prisms practice worksheet Open the practice worksheet

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PDFs print on US Letter paper. Free for classroom and home use.

Watch: Surface Area of Prisms — Step by Step Guide
Key idea

Surface area = the total area of all faces. Rectangular prism: six faces, three pairs. Triangular prism: five. General rule: SA = 2B + Ph — two bases, plus the band around the outside. Units are squared.

Sample problems

  1. Find the surface area of a box 6 by 3 by 2.
  2. Find the volume of that box.
  3. Find the surface area of a cube with edge 4.
  4. Find the volume of that cube.

Common mistakes to watch for

  • Added only 20 + 12 + 15 = 47, counting three faces instead of six. The answer is exactly half, which is the fingerprint.
  • Compared 94 and 60 as though one should be larger. They answer different questions and cannot be ranked.
  • Applied the six-face rectangular formula, or forgot to halve the triangular ends.

The answer key explains each one, so you can tell what a wrong answer means.

How to use this set

  1. Teach with the slides (about 15 minutes), or watch the video together.
  2. Practice with the worksheet. Questions climb from fluency to application to reasoning.
  3. Check understanding with the exit ticket, and send the homework home.
  4. Mark with the answer key — each answer shows the steps and the most likely mistake.

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