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Cogito

Grade 3 Math · Chapter 4 · Lesson 5

Practice Worksheet

Perimeter

The distance all the way round.

10 problems · about 12 minutes · 3.MD.D.8

NameDate

Figure — use these to answer the problems

The heavy outline is the perimeter. Add the four sides.

Area · squares inside

15

Perimeter · walk around

16

5 × 3 = 15 · 5 + 3 + 5 + 3 = 16

Width5
Height3
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

3 problems

  1. From “Breaking a Big Area Apart”

    Area of 5 by 9, split as 5 by 5 and 5 by 4?

    Answer

  2. From “Finding a Missing Side”

    Area 42, one side 6. What is the other side?

    Answer

  3. From “Area by Multiplying”

    A rectangle 8 by 7. What is its area?

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. A rectangle 9 by 5. What is its perimeter?

    Answer

  2. What units does a perimeter use?

    • Units, because it is a length.
    • Square units.

  3. A rectangle 7 by 3. What is its perimeter?

    Answer

Build It Up

The same ideas with more to keep track of.

1 problem

  1. A square with sides of 6. What is its perimeter?

    Answer

Stretch Yourself

Mixed problems. Work out what kind of question it is before you start.

3 problems

  1. A rectangle 10 by 2. What is its perimeter?

    Answer

  2. The Fence

    A garden is 8 m by 6 m. How much fence goes all the way round?

    Answermetres

  3. The Picture Frame

    A frame is 9 cm by 4 cm. What is its perimeter?

    Answercm