Area: Find the Missing Side Worksheets for 3rd Grade
Use the area and one side of a rectangle to find the other side. 15 free printable worksheets, each with an answer key.
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Click a worksheet to open the PDF, or grab the matching answer key. Every sheet prints on one page.
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Area: Find the Missing Side: what children learn
Since area = length × width, a missing side can be found by dividing the area by the known side, or by asking which number times the known side gives the area. These pictures are not drawn to scale.
Area: Find the Missing Side: worked example
The area is 18 square units. One side is 3 units. What is the missing side? 6
Think 3 × __ = 18. Since 3 × 6 = 18, the missing side is 6 units.
Area: Find the Missing Side: a common mistake to watch for
Kids sometimes subtract the known side from the area instead of dividing.
Area: Find the Missing Side: how to help at home or in class
Give your child 24 square tiles and ask for every rectangle that can be made with all of them: 1 by 24, 2 by 12, 3 by 8 and 4 by 6. Then say one side is 3 and ask how many rows of 8 would be needed, or build it to find out. When your child links the missing side to a multiplication fact, mixed area and perimeter questions are next.
What is on these Area: Find the Missing Side worksheets
This set has 15 different worksheets for 3rd grade, with 9 questions on each and a matching answer key for every sheet. The instruction printed on each worksheet is: “Use the area to find the missing side.”
Every answer on every sheet is checked by a separate program before the worksheet is published. How we check answers