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Find the missing side length of a rectangle

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Find the missing side length of a rectangle — free printable Grade 3 math worksheet

This worksheet helps students practice finding the missing side length of rectangles by using area calculations. Teachers can use it to reinforce understanding of the relationship between length, width, and area in Grade 3 math. Ideal for strengthening problem-solving skills with medium-difficulty area problems.

Learning objectives

  • Calculate the missing side length of a rectangle using the area formula
  • Apply multiplication and division to solve for unknown dimensions
  • Interpret area-related word problems involving rectangles

How to use this worksheet

  1. Select “Sign in / Sign up to download”, then sign in with Google or email to get the PDF from KiwiBee Printables.
  2. Print at home or in class for Grade 3; it's no-prep, with no extra materials needed.
  3. Hand it out as classwork, homework, or a quick warm-up.

Good for

ClassworkHomeworkWarm-upCentersSmall groups

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