Lesson 7 Replacing Letters with Numbers

Lesson 7: Replacing Letters with Numbers

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• What is the length of one side of the square?

• What is the formula for the area of a square?

• What is the square's area as a multiplication expression?

• What is the square's area?

Poll

What is the area of the square?

Draw

Fill in the blanks

• What does the "b" represent?

• Given that the second rectangle is divided into 4 equal parts, what is "x"? How did you arrive at the answer?

• What is the total length of the second rectangle?

• If the two large rectangles have equal lengths and widths, find the area of the of each rectangle.

Multiple Choice

What is A

THE FIRST RECTANGLE

• 7 units

• 8 units

• 46 units

• 9 units

Multiple Choice

What is B

THE SECOND RECTANGLE

• 46 m

• 50m

• 48 m

• 52 m

Multiple Choice

What is C

THE FIRST RECTANGLE

• 5 UNITS

• 4 UNITS

• 3 UNITS

• 2 UNITS

Multiple Choice

What is D

THE SECOND RECTANGLE

• 29 M

• 30M

• 31M

• 32M

Multiple Choice

What is E

THE FIRST RECTANGLE

• 8 UNITS X 3 UNITS

• 9 UNITS X 2 UNITS

• 7 UNITS X 4 UNITS

• 7 UNITS X 3 UNITS

Multiple Choice

What is F

THE SECOND RECTANGLE

• 50 M X 30 M

• 52 M X 32 M

• 46 M X 32 M

• 51 M X 30

Multiple Choice

What is G

THE FIRST RECTANGLE

• 31 SQUARE UNITS

• 30 SQUARE UNITS

• 29 SQUARE UNITS

• 28 SQUARE UNITS

Multiple Choice

What is H

THE SECOND RECTANGLE

• 1,490 $$m^2$$

• 1,488 $$m^2$$

• 1,470 $$m^2$$

• 1,472 $$m^2$$

1. What does the "L" represent?

2. What does the "w" represent?

3. What does the "h" represent?

4. Since we know the formula for Volume = length x width x height, what number can we substitute for "L" in the formula?

5. What number can we substitute for "w"?

6. What number can we substitute for "h"?

7. Determine the volume for the second right rectangular prism?

Fill in the Blanks

Fill in the Blanks

Fill in the Blanks

Fill in the Blanks

Fill in the Blanks

Fill in the Blanks

Multiple Choice

WHAT IS G?

FIRST FIGURE?

• 12 units x 5 units x 15 units

• 12 units x 5 units x 10 units

Multiple Choice

WHAT IS H?

FIRST FIGURE?

• 23 cm x 4 cm x 7 cm

• 23 cm x 4 cm x 6 cm

Multiple Choice

WHAT IS I?

FIRST FIGURE?

• 800 cubic units

• 900 cubic units

Multiple Choice

WHAT IS J?

FIRST FIGURE?

• 644 $$cm^3$$

• 640 $$cm^3$$

Poll

How do you feel about this lesson?

• OMG!

• NOT SURE!

• I'm good!

• I'm not good!