Refer to our Texas Go Math Grade 2 Answer Key Pdf to score good marks in the exams. Test yourself by practicing the problems from Texas Go Math Grade 2 Lesson 15.3 Answer Key Compose Three-Dimensional Solids.

## Texas Go Math Grade 2 Lesson 15.3 Answer Key Compose Three-Dimensional Solids

**Explore**

Circle the solids with curved surfaces. Draw an X on the solids with flat surfaces.

Answer:

HOME CONNECTION • Your child sorted the solids on this page using the attributes of the solids.

Answer:

Sphere has no faces, edges, and vertex

Cone has 2 faces, 1 edge, and 1 vertex

The cylinder has 3 faces, 3 edges, and 0 vertex

The triangular prism has 5 faces, 9 edges, and 6 vertices

Cube has 6 faces, 12 edges, and 8 vertices

The rectangular prism has 6 faces, 12 edges, and 8 vertices

**Math Talk**

**Mathematical Processes**

Name the shapes you drew an X on. Describe how they are different.

Answer:

The rectangular prism has 6 faces, 12 edges, and 8 vertices

The triangular prism has 5 faces, 9 edges, and 6 vertices

Cube has 6 faces, 12 edges, and 8 vertices

**Model and Draw**

Build this rectangular prism using 12 unit cubes.

The shading shows the top and front views.

top view

front view

Answer:

**Share and Show**

Build a rectangular prism with the given number of unit cubes. Shade to show the top and front views.

Question 1.

9 unit cubes

Answer:

Question 2.

16 unit cubes

Answer:

**Problem Solving**

Build a rectangular prism with the given number of 7 unit cubes. Shade to show the top and front views.

Question 3.

24 unit cubes

Answer:

Question 4.

**H.O.T. Multi-Step** The top, side, and front views of a rectangular prism are shown. Build the prism. How many unit cubes are used to build the solid?

___________ unit cubes

Answer:

18 cube units

Explanation:

Volume = length × width × height

= 3 × 2 × 3

= 18 cube units

Question 5.

**H.O.T.** Jen uses 18 cubes to build a rectangular prism. The top and front views are shown. Shade to show the side view.

Answer:

Explanation:

Volume = length × width × height

= 3 × 2 × 3

= 18 cube units

**Daily Assessment Task**

**Choose the correct answer.**

Question 6.

Apply Theo builds the first layer of a prism using 4 cubes. He adds 3 more layers of 4 cubes each. How many cubes are used for the prism?

(A) 7

(B) 16

(C) 12

Answer:

16

Theo builds the first layer of prism = 4 cubes

Question 7.

Analyze Dan built this rectangular prism. How many unit cubes did he use?

(A) 18

(B) 10

(C) 24

Answer:

24 unit cubes

Explanation:

Volume = length × width × height

= 3 × 2 × 4

= 24

Question 8.

**Multi-Step** Ella builds the first layer of a rectangular prism using 6 cubes. James adds 2 more layers of 6 cubes each. How many cubes are used for the prism?

(A) 8

(B) 18

(C) 12

Answer:

18

Explanation:

Ella builds first layer = 6 cubes

James adds 2 more layers = 6 × 2 = 12

2 layers of 6 cubes each = 12 + 6 = 18

Question 9.

**Texas Test Prep** Tyler built a rectangular prism using unit cubes. How many unit cubes did Tyler use?

(A) 27

(B) 9

(C) 18

Answer:

27 cube units

Explanation:

Number of cubes in each layer = 9

Number of layers = 3

Number of cube units = 9 × 3

= 27 cube units

**TAKE HOME ACTIVITY** • Ask your child to show how he or she solved on exercise in the lesson.

Answer:

### Texas Go Math Grade 2 Lesson 15.3 Homework and Practice Answer Key

**Shade to show the top and front views of each rectangular prism.**

Question 1.

Answer:

Question 2.

Answer:

**Problem Solving**

Question 3.

The top, side, and front views of a rectangular prism are shown. How many unit cubes are used to build the solid?

__________ cubes

Answer:

18 cube units

Explanation:

Volume = length × width × height

= 3 × 2 × 3

= 18 cube units

**Lesson Check**

**Choose the correct answer.**

Question 4.

Ken built a rectangular prism using unit cubes. How many unit cubes did Ken use?

(A) 24

(B) 8

(C) 12

Answer:

24 cube units

Explanation:

Volume = length × width × height

= 4 × 2 × 3

= 24

Question 5.

**Multi-Step** Abby builds the first layer of a rectangular prism using 6 cubes. Liam adds 2 more layers. How many cubes are used for the prism?

(A) 7

(B) 18

(C) 10

Answer:

18

Explanation:

Number of cubes Abby builds first layer=6

Liam add 2 more layers= base cubes + 2nd layer cubes + 3rd layer cubes

Liam add 2 more layers= 6 + 6 + 6

= 18

Question 6.

Colby builds the first layer of a rectangular prism using 8 cubes. He adds another layer of cubes. How many cubes are used for the prism?

(A) 9

(B) 8

(C) 16

Answer:

16

Explanation:

Number of cubes Colby builds the first layer of a rectangular prism = 8

He adds another layer of cubes = base layer + another layer

cubes used = 6 +6

cubes used = 12

Question 7.

Erica builds the first layer of a rectangular prism using 2 cubes. She adds 3 more layers. How many cubes are used for the prism?

(A) 4

(B) 8

(C) 6

Answer:

8 cubes

Explanation:

Erica builds the first layer of a rectangular prism using cubes = 2

she adds 3 more layers = 3 × 2 = 6

Number of cubes = 6 + 2

Number of cubes = 8