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Cogito

Grade 3 Math · Chapter 4 · Lesson 2

Practice Worksheet

Area by Multiplying

Rows and columns again, so you can multiply.

10 problems · about 12 minutes · 3.MD.C.7

NameDate

Figure — use these to answer the problems

The width times the height gives the area.

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.

2 problems

  1. From “What Area Is”

    A rectangle 7 across and 3 down. What is its area?

    Answer

  2. From “Two-Step Problems With a Letter”

    8 × 5 − 14 = ?

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. A rectangle 8 by 7. What is its area?

    Answer

  2. Why can you multiply to find an area?

    • The squares form an array of rows and columns.
    • Because that is the rule for rectangles.

  3. A rectangle 7 by 6. What is its area?

    Answer

  4. A rectangle 8 by 5. What is its area?

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. A square 6 by 6. What is its area?

    Answer

  2. A rectangle 9 by 3. What is its area?

    Answer

Stretch Yourself

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

2 problems

  1. The Rug

    A rug is 6 metres by 4 metres. What is its area?

    Answersquare metres

  2. The Poster

    A poster is 9 cm by 7 cm. What is its area?

    Answersquare cm