
Four rectangles, four sets of labeled dimensions, and one formula to learn: finding perimeter of rectangles has never been easier to introduce at the kitchen table.
Labeled 3rd Grade Math, this one-page worksheet introduces the perimeter formula P = 2(l + w) in a reference box at the top, then puts it immediately to use across four problems. Each problem shows a drawn rectangle with two labeled side measurements in different units: centimeters, meters, inches, and feet. Students write their answer on the Perimeter line below each shape. It fits squarely into a 3rd grade geometry or measurement unit.
Finding perimeter of rectangles works well as a guided first lesson where you walk through the formula together before releasing your student to try problems three and four independently. The show-your-work space inside each problem box reinforces the habit of writing out steps rather than jumping to an answer, which pays off as problems grow more complex in later grades.


Pencil is the right call here since students need room to show their multiplication or addition work and may want to revise. The four problems move at a steady pace, making this a good fit for independent practice once you have walked through the formula together as teacher and student.

Portrait orientation, standard copy paper. Printing two or three copies lets your homeschooler revisit the problems on different days without reusing a marked-up sheet.