Students can use the **Spectrum Math Grade 3 Answer Key Chapter 7 Posttest **as a quick guide to resolve any of their doubts.

## Spectrum Math Grade 3 Chapter 7 Posttest Answers Key

**Check What You Learned**

**Choose an answer.**

Question 1.

a. About how much does a paper clip weigh?

a. 1 gram

b. 100 grams

c. 1,000 grams

Answer:

a. 1 gram,

Explanation:

Generally the mass of a regular paper clip is about 1 gram. The paper clip weighs about 1 gram respectively.

b. About how much juice can a baby bottle hold?

a. 3 liters

b. 30 milliliters

c. 300 liters

Answer:

30 milliliters,

Explanation:

Generally about 30 milliliters of juice can be a baby bottle can hold.

**Solve.**

Question 2.

Kennedy popped 24 cups of popcorn in 3 days. If she popped the same number of cups each day, how many cups did she pop each day?

Answer:

8 cups,

Explanation:

Kennedy popped 24 cups of popcorn in 3 days, Number of cups of popcorn did Kennedy popped in 3 days = 24 cups, Number of cups of popcorn did Kennedy popped each day = 24 cups / 3 = 8 cups , Therefore 8 cups did Kennedy pop each day.

**Complete the graphs.**

Question 3.

a.

Key __________ = 20 miles

Answer:

Key is 20 miles for Team 1,

Explanation:

Completed the graph Key is 20 miles which comes for Team 1.

b.

Answer:

Explanation:

Completed the graph X-axis favorite pets and Y-axis as number of favorite pets.

**Find the area of the figure.**

Question 4.

a.

____________ sq. units

Answer:

6 sq. units,

Explanation:

In given rectangle length as 6 units and breadth as 1 unit. So, area of rectangle is (length X breadth) = 6 units X 1 unit = 6 sq. units respectively.

b.

____________ sq. units

Answer:

9 sq. units,

Explanation:

Given from figure each side represents 3 units so, area of square is (side X side) sq. units = 3 units x 3 units = 9 sq. units, therefore area of square is 9 sq. units.

Question 5.

Draw the square units to show the area of the rectangle.

A = ____________ sq. units

Answer:

24 sq. units,

Explanation;

From the given figure rectangle, length is 8 units and breadth is 3 units, so therefore the area of rectangle is l X b that is 8 X 3 = 24 sq. units .

Question 6.

Multiply to find the area.

A = _____________ sq. in.

Answer:

12 sq. in,

Explanation:

Given, from figure length is 4 in. and breadth is 3 in. so, area is 4 X 3 = 12 sq. in.

Question 7.

Find the area.

A = _____________ sq. units

Answer:

24 sq. units,

Explanation:

Given, In the figure ABCDEF ,draw a line from D to G then DG = 3 units so, area of a square DEFG each side is 3 units that is 3 X 3 = 9 sq. units, Area of rectangle ABCG length is 5 units and breadth is 3 units that is 5 X 3 = 15 sq. units. So, therefore Area of square DEFG + Area of rectangle ABCG = 9 sq. units + 15 sq. units = 24 sq. units.

Question 8.

**Solve.**

An equilateral triangle has one side that measures 9 cm. How many centimeters is the perimeter of the triangle?

Answer:

27 centimeters,

Explanation:

An equilateral triangle which contains all sides equal . so, given one side is 9 cm therefore perimeter of triangle ABC = AB + BC + CA = 9 cm + 9 cm + 9 cm = 27 cm. So, perimeter of triangle is 27 centimeters.