Measurement
Perimeter of rectangles
Find the total distance around a rectangle.
Worked example · Three practice questions
A LITTLE PRACTICE. A NEW DISCOVERY.
Measurement lessons: perimeter and volume
Different measurements answer different questions. Perimeter tells you the distance around a boundary. Volume tells you how much three-dimensional space a solid occupies. Choosing the correct measurement comes before choosing a calculation.
Choose a starting point
Trace a rectangle’s boundary to investigate perimeter. For volume, build a prism from unit cubes and count complete layers. Keep length units and cubic units separate when reporting answers.
Try a hands-on activity
Use a small box or a rectangular drawing to identify length and width. Explain which measurement describes ribbon around the outside and which measurement describes cubes packed inside the box.
A mistake to watch for
Area, perimeter, and volume measure different things. A correct numerical calculation still needs the appropriate unit and interpretation.
Grade 4 measurement
Read the worked example, try the questions, and follow the linked worksheet for extra practice.
Grade 5 measurement
Read the worked example, try the questions, and follow the linked worksheet for extra practice.
Measurement
Volume with unit cubes
Count layers of unit cubes to find a rectangular prism’s volume.
Worked example · Three practice questions
Make practice a small daily habit
Choose one lesson, talk through the example, and try the three questions. Revisit the explanation when an answer feels uncertain. Follow the related lesson links when your learner is ready for another step.