Created by Molly Houghton
16 questions
4th Grade
Physical Education
Updated Sep 2026
Missing Sides area/perimeter is a Grade 4 mathematics worksheet that helps students find an unknown side length when they know a shape’s perimeter or area. The 16 items include 5 fill-in-the-blank problems and 11 multiple-choice questions covering perimeter formulas, area and perimeter word problems, missing dimensions, and appropriate measurement units. Students practise deciding whether to use addition, multiplication, or division to solve for a missing side. Problems include finding a rectangle’s width from its perimeter, finding length from area and width, calculating fencing needed around a rectangle, and identifying which expression does not represent perimeter. This free printable worksheet includes a complete answer key, making it useful for independent practice, homework, review, or a Grade 4 mathematics assessment.
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WorksheetsAnswer Key5 feet
L= 7
P = L X W
Perimeter = 32 Units
Area = 10 units x 3 units
Perimeter = 38 units
A Giraffe
4
4 ft
10 cm
This Grade 4 worksheet focuses on finding an unknown side length from a shape’s area or perimeter. Its 16 items combine 5 fill-in-the-blank questions with 11 multiple-choice questions, asking students to apply perimeter formulas, divide area by a known dimension, and solve practical problems such as determining the fencing needed for a rectangular chicken pen.
First review the difference between perimeter as the distance around a shape and area as the space inside it. Model one fill-in-the-blank perimeter problem by subtracting the known side lengths from the total, then model an area problem by dividing the area by the known dimension. Use the multiple-choice formula question and fencing scenario to have students explain why each operation and unit is appropriate.
Students may multiply length and width when a perimeter problem requires addition, or add side lengths when an area problem requires multiplication. They may also forget to subtract all known sides from the perimeter, divide area by the known dimension, or report square units for perimeter and linear units for area. Check their work especially on the fill-in-the-blank problems, where an incorrect operation is less visible than in a multiple-choice item.
On Wayground, this worksheet is available as a printable PDF and as a digital quiz, and it includes a complete answer key for the 5 fill-in-the-blank and 11 multiple-choice items. Printable submissions can be graded by scanning student work with the Wayground for Teachers app. The PDF option can also support schools that are reducing screen time.
Use the worksheet’s Advanced Settings to create an alternate version with more font spacing or a larger font size, which can make the perimeter and area word problems easier to track. You can also enable a dyslexia-friendly font or translate the worksheet into another language when those options support access to the rectangular-area and perimeter questions.
Wayground offers a broad collection of free printable worksheets and practice problems across subjects, with downloadable PDFs and answer keys to help students build essential skills and concepts. Browse more resources at https://wayground.com/en-us/worksheets.
