teaching resource

Volume of Irregular Prisms – Worksheet

Teach Starter Publishing
Google Slide, PDF, PowerPoint | 1 page | Years: 6

Calculate the volume of irregular prisms and solve real-world problems with this worksheet.

Volume of Irregular 3D Objects Worksheet

Have your students learned how to find the volume of a rectangular prism? If so, the next part of your maths unit may be introducing how to find the volume of irregular prisms that are composed of multiple rectangular prisms. If your students are wondering what an irregular prism is, you can explain that it is a three-dimensional object made up of 2 or more objects. Students must learn to calculate the volume of each object and then add them together.

This resource aims to practise calculating the volume of rectangular prisms and composite objects made of multiple rectangular prisms. Students must solve problems that involve counting unit cubes and calculating the volume with the standard formula, l × w × h. Students will also use their answers from problems on the worksheet to answer true and false questions. A variety of word problems are included on the back side of the worksheet to promote critical thinking and real-world application.

Answer pages are included with your download to make marking fast and easy! 

Tips for Differentiation + Scaffolding 

In addition to independent student work time, use this worksheet as an activity for:

  • guided maths groups
  • lesson warm-up
  • lesson wrap-up
  • fast finishers 
  • homework assignment
  • whole-class review (via smartboard)

Extend students by inviting them to convert the dimensions of given shapes to other units as an added challenge. For example, on question #5, challenge students to convert the dimensions from cm to mm and determine the volume. What patterns do they notice when doing this to multiple prisms?

For students needing additional support, work one-on-one, in a small group, or with a peer tutor. Allow the use of notes, completed examples and a calculator. Provide 3D shapes manipulatives and unit cubes.

🖨️ Easily Download & Print

Use the dropdown icon on the Download button to choose between the PDF or editable PowerPoint or Google Slides version of this resource. 

To save paper, we suggest printing this 2-page worksheet double-sided.

Additionally, project the worksheet onto a screen and work through it as a class by having students record their answers in their notebooks.

Get more worksheets to have handy!


This resource was created by Lorin Davies, a Teach Starter Collaborator.

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