This handy Math in Focus Grade 5 Workbook Answer Key Chapter 15 Practice 1 Building Solids Using Unit Cubes provides detailed solutions for the textbook questions.

## Math in Focus Grade 5 Chapter 15 Practice 1 Answer Key Building Solids Using Unit Cubes

**Find the number of unit cubes used to build each solid.**

Question 1.

__________ unit cubes

Answer:

5 unit cubes,

Explanation:

As a cube has all its sides of the same length.

A unit cube has all its sides of length 1 unit.

we have 5 unit cubes,

So, the volume of a 5 unit cubes = 5 X (Side × Side × Side),

= 5 X (1 unit × 1 unit × 1 unit),

= 5 X (unit cubes).

Question 2.

__________ unit cubes

Answer:

7 unit cubes,

Explanation:

As a cube has all its sides of the same length.

A unit cube has all its sides of length 1 unit.

we have 7 unit cubes,

So, the volume of a 7 unit cubes = 7 X (Side × Side × Side),

= 7 X (1 unit × 1 unit × 1 unit),

= 7 unit cubes.

Question 3.

__________ unit cubes

Answer:

8 unit cubes,

Explanation:

As a cube has all its sides of the same length.

A unit cube has all its sides of length 1 unit.

we have 8 unit cubes,

So, the volume of a 8 unit cubes = 8 X (Side × Side × Side),

= 8 X ( 1 unit × 1 unit × 1 unit),

= 8 unit cubes.

Question 4.

__________ unit cubes

Answer:

6 unit cubes,

Explanation:

As a cube has all its sides of the same length.

A unit cube has all its sides of length 1 unit.

we have 6 unit cubes,

So, the volume of a 6 unit cubes = 6 X (Side × Side × Side),

=6 X (1 unit × 1 unit × 1 unit),

= 6 unit cubes.

Question 5.

__________ unit cubes

Answer:

8 unit cubes,

Explanation:

As a cube has all its sides of the same length.

A unit cube has all its sides of length 1 unit.

we have 8 unit cubes,

So, the volume of a 8 unit cubes = 8 X (Side × Side × Side),

= 8 X (1 unit × 1 unit × 1 unit),

= 8 unit cubes.

Question 6.

__________ unit cubes

Answer:

9 unit cubes,

Explanation:

As a cube has all its sides of the same length.

A unit cube has all its sides of length 1 unit.

we have 9 unit cubes,

So, the volume of a 9 unit cubes = 9 X (Side × Side × Side),

= 9 X (1 unit × 1 unit × 1 unit),

= 9 unit cubes.

**Find the number of unit cubes used to build each solid.**

Question 7.

__________ unit cubes

Answer:

7 unit cubes,

Explanation:

As a cube has all its sides of the same length.

A unit cube has all its sides of length 1 unit.

we have 7 unit cubes,

So, the volume of a 7 unit cubes = 7 X (Side × Side × Side),

= 7 X ( 1 unit × 1 unit × 1 unit),

= 7 unit cubes.

Question 8.

__________ unit cubes

Answer:

9 unit cubes,

Explanation:

As a cube has all its sides of the same length.

A unit cube has all its sides of length 1 unit.

we have 9 unit cubes,

So, the volume of a 9 unit cubes = 9 X (Side × Side × Side),

= 9 X (1 unit × 1 unit × 1 unit),

= 9 unit cubes.

Question 9.

__________ unit cubes

Answer:

7 unit cubes,

Explanation:

As a cube has all its sides of the same length.

A unit cube has all its sides of length 1 unit.

we have 7 unit cubes,

So, the volume of a 7 unit cubes = 7 X (Side × Side × Side),

= 7 X (1 unit × 1 unit × 1 unit),

= 7 unit cubes.

Question 10.

__________ unit cubes

Answer:

10 unit cubes,

Explanation:

As a cube has all its sides of the same length.

A unit cube has all its sides of length 1 unit.

we have 10 unit cubes,

So, the volume of a 10 unit cubes = 10 X (Side × Side × Side),

= 10 X (1 unit × 1 unit × 1 unit),

= 10 unit cubes.

Question 11.

__________ unit cubes

Answer:

15 unit cubes,

Explanation:

As a cube has all its sides of the same length.

A unit cube has all its sides of length 1 unit.

we have 15 unit cubes,

So, the volume of a 15 unit cubes = 15 X (Side × Side × Side),

= 15 X (1 unit × 1 unit × 1 unit),

= 15 unit cubes.