Skip to lesson

Choose “Save as PDF” in the print dialog to keep a copy.

Cogito

Grade 3 Math · Chapter 4 · Lesson 6

Practice Worksheet

Telling Area and Perimeter Apart

Two different questions about the same shape.

10 problems · about 14 minutes · 3.MD.C.7, 3.MD.D.8

NameDate

Figure — use these to answer the problems

Change one side. The two numbers do not change by the same amount.

Area · squares inside

24

Perimeter · walk around

20

6 × 4 = 24 · 6 + 4 + 6 + 4 = 20

Width6
Height4
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

1 problem

  1. From “Perimeter”

    A rectangle 9 by 5. What is its perimeter?

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. A rectangle 9 by 4. What is its area?

    Answer

  2. A rectangle 9 by 4. What is its perimeter?

    Answer

  3. Paint for a wall. Area or perimeter?

    • Area
    • Perimeter

  4. Edging round a flower bed. Area or perimeter?

    • Perimeter
    • Area

Build It Up

The same ideas with more to keep track of.

2 problems

  1. A rectangle 8 by 3. What is its area?

    Answer

  2. A rectangle 8 by 3. What is its perimeter?

    Answer

Stretch Yourself

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

3 problems

  1. The Carpet

    A room is 7 m by 4 m. How much carpet covers the floor?

    Answersquare metres

  2. The Ribbon

    A box top is 7 cm by 4 cm. How much ribbon goes round the edge?

    Answercm

  3. Same Perimeter

    A 6 by 2 rectangle and a 5 by 3 rectangle both have perimeter 16. What is the area of the 5 by 3?

    Answersquare units