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Cogito

Grade 6 Math · Chapter 7 · Lesson 2

Practice Worksheet

Surface Area from Nets

Unfold the solid and add up the faces.

10 problems · about 18 minutes · 6.G.A.4

NameDate

Figure — use these to answer the problems

This solid has six faces. Surface area counts their squares, not the cubes inside.
  • Cubes in one layer4 × 3 = 12
  • Layers2
  • 4 × 3 × 224 cubic units
Length4
Width3
Height2
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

2 problems

  1. From “Area of Triangles”

    Base 14, height 6. Area?

    Answer

  2. From “Two Variables That Move Together”

    If y = 5x, what is y when x is 8?

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. A cube with edge 5. Surface area?

    Answer

  2. What units does surface area use?

    • Square units.
    • Cubic units.

  3. A cube with edge 2. Surface area?

    Answer

  4. A cube with edge 4. Surface area?

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. A box 3 by 3 by 2. Surface area?

    Answer

  2. How many faces does a rectangular box have?

    Answer

Stretch Yourself

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

2 problems

  1. The Cube

    A cube with edge 3. What is its surface area?

    Answersquare units

  2. The Box

    A box 5 by 4 by 2. What is its surface area?

    Answersquare units