16 questions
4th - 4th Grade
Mathematics
Missing Side Perimeter is a free printable Grade 4 mathematics worksheet that helps students find an unknown side length when the total perimeter and other side lengths are known. Students solve 11 fill-in-the-blank problems and 5 multiple-choice questions by using the relationship between perimeter and the lengths of all sides, with measurements presented in units such as feet and inches. The worksheet also includes a rectangle problem that asks students to find width from area and a known length, giving them practice distinguishing related measurement skills and units. It is useful for guided practice, independent work, review, or a quick check of students’ ability to reason backward from a perimeter total. The worksheet includes a complete answer key for efficient checking and feedback.
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WorksheetsAnswer KeyThis Grade 4 worksheet focuses on finding an unknown side length by subtracting known side lengths from a shape’s total perimeter. It uses 11 fill-in-the-blank items and 5 multiple-choice questions, including measurements in feet, inches, and other units, plus one rectangle problem that requires dividing area by a known length to find width.
First model that perimeter is the sum of every side, then demonstrate subtracting the known side lengths from the given perimeter to isolate the missing length. Have students label the known measurements on each diagram, write the subtraction equation, and explain why their answer completes the total perimeter before assigning the fill-in-the-blank and multiple-choice items.
Students may add the known sides without subtracting that total from the perimeter, or use only one known side when several are shown. Also watch for confusion between length units and square units: the soccer-field item asks students to divide 56 square yards by 8 yards to find a width of 7 yards, not report an area measurement.
Wayground provides this worksheet as a printable PDF and as a digital quiz, and it includes a complete answer key for the 11 fill-in-the-blank and 5 multiple-choice items. For printable submissions, you can scan student work with the Wayground for Teachers app to help grade responses efficiently.
Use the worksheet’s Advanced Settings to adjust font spacing or choose a larger font size so the perimeter diagrams, fill-in-the-blank prompts, and answer choices are easier to read. You can also enable a dyslexia-friendly font or translate the worksheet into another language when those options better support access to the measurement tasks.
Wayground offers a broad collection of free printable worksheets and practice problems across subjects, with downloadable PDFs and answer keys to support essential skills and concepts. Browse more resources at https://wayground.com/en-us/worksheets.
