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

Check What You Learned

Question 1.
a. About how much does a paper clip weigh?
a. 1 gram
b. 100 grams
c. 1,000 grams
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
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?
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 Key is 20 miles for Team 1,

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

b.  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
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
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
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.
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
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?