All the solutions provided in 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
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.
4 × 8 = _____________
By multiplying 4 and 8 we get 32.
7 × 7 = _____________
By multiplying 7 and 7 we get the value is 49.
3 × 12 = _____________
By multiplying 3 and 12, the value is 36.
10 × 4= _____________
By multiplying 4 and 10, we get the value is 40.
9 × 11= _____________
By multiplying 9 and 11, we get 99.
4 × 15 = _____________
By multiplying 4 and 15, we get the value is 60.
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
Use the review vocabulary to complete the chart.
Look at the array below. Write a multiplication problem to describe it. Then find the product.
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 sides’ lengths. Exchange papers with a friend to find the area of the rectangle.
Answer: The area of the rectangle is 21.
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 rectangle’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.
Follow the steps on the back to make your Foldable.
(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(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)
P = 60 inches.
(iv) Given the square Area, draw the figure and find the perimeter.
The perimeter of a square is 4a
P = 240 yd.
(v) Given the square, find the perimeter and Area.
Perimeter = 4a
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