All the solutions provided inÂ **McGraw Hill My Math Grade 4 Answer Key PDF Chapter 13 Perimeter and Area **will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 4 Answer Key Chapter 13 Perimeter and Area

**Essential Question**

Why is it important to measure perimeter and area?

Answer: The perimeter measures the outside distance of a shape. The area measures the inside space of a shape. The importance of measuring perimeter and area is for constructing a house, for painting purposes, for making crafts, etc.

**Am I Ready**

**Draw an array to model each multiplication problem. Find the product.**

Question 1.

4 Ă— 8 = _____________

Answer: 32

Explanation:

By multiplying 4 and 8 we get 32.

Question 2.

7 Ă— 7 = _____________

Answer:49

Explanation:

By multiplying 7 and 7 we get the value is 49.

Question 3.

3 Ă— 12 = _____________

Answer: 36

Explanation:

By multiplying 3 and 12, the value is 36.

Question 4.

10 Ă— 4= _____________

Answer: 40

Explanation:

By multiplying 4 and 10, we get the value is 40.

Question 5.

9 Ă— 11= _____________

Answer: 99

Explanation:

By multiplying 9 and 11, we get 99.

Question 6.

4 Ă— 15 = _____________

Answer: 60

Explanation:

By multiplying 4 and 15, we get the value is 60.

Question 7.

Cora is making a picture. It will be a square. How many sides are the same length?

Answer: The square consists of four sides. All four sides are the same length.

**My Math Words**

Review Vocabulary

length

product

**Making Connections**

Use the review vocabulary to complete the chart.

Look at the array below. Write a multiplication problem to describe it. Then find the product.

Answer: 50

Explanation:

The shaded array consists of 10 rows and 5 columns.

So, the multiplication of 10 x 5 is 50.

By multiplying 5 and 10, we get the value is 50.

What number represents the length of this array?

Answer: The column number represents the length of the array. The number is 8

Draw an array that represents a product of 20.

Answer: The product of 20 is 4 x 5.

By multiplying 4 and 5, we get the product value is 20.

Suppose the array below represents a figure. Describe this figure’s sides.

Answer: The figure looks like a rectangle. Rectangle opposite sides are equal in length.

**My Vocabulary Cards**

Ideas for Use

- Write a tally mark on each card every time you read or write the word. Challenge yourself to use at least 3 tally marks for each card.
- Use the blank cards to review problem-solving strategies, such as working backward, making a table, or drawing a picture.

The distance around a dosed figure.

Would it be possible to double the lengths and sides of any figure to find its perimeter? Explain.

Answer: Yes, it is possible. For finding perimeter,

The formula is Perimeter = 2(L+B)

The number of square units needed to cover a figure without any overlap.

Draw a rectangle. Label the sidesâ€™ lengths. Exchange papers with a friend to find the area of the rectangle.

Answer: The area of the rectangle is 21.

Explanation:

The area of the Rectangle is Length x width.

A = 7 x 3 = 21.

A square with a side length of one unit.

A friend tells you he used grid paper to draw a rectangle with a length of 12 unit squares and a width of 5 unit squares. What is the rectangleâ€™s total number of unit squares?

Answer: The rectangle’s total number of unit squares is 12 x 5 is 60.

A unit for measuring area. Contains one unit square.

Explain how using square units to measure is different from using units.

Answer: Square units are used to measure the area.

**My Foldable**

Follow the steps on the back to make your Foldable.

Answer:

(i) Given the Perimeter value, we will draw a figure and find the area.

The figure is,

The area of a Rectangle is, L x B

= 20 x 23

= 460 sq.inches.

(ii) Given the rectangle, find the perimeter and Area.

Perimeter = 2(l+b)

= 2(3+11)

=2(14) = 28 cm

Now, the Area of a Rectangle is l x b.

= 3 x 11

A = 33 sq.cm.

(iii) Given the Area, draw the figure and find the perimeter.

The perimeter is 2(l+b)

= 2(4+26)

= 2(30)

P = 60 inches.

(iv) Given the square Area, draw the figure and find the perimeter.

The perimeter of a square is 4a

= 4*60

P = 240 yd.

(v) Given the square, find the perimeter and Area.

Perimeter = 4a

= 4(1)

=4 cm

Now, the Area of a square is,

= 4 x 4

A = 16 sq.cm.

(vi) Given the Perimeter value, we will draw a figure and find the area.

The figure is,

The Area of a square is, a x a

A = 34 x 34

A = 1156 sq.in