This lesson, led by Mrs. Zapia, covers the addition and subtraction of rational numbers. Students learn to apply integer rules to rational numbers using a number line. Exercises include modeling age problems and finding sums and differences. The lesson concludes with a summary of key concepts.

What is the primary focus of the lesson introduced by Mrs. Zapia?

• Multiplication of rational numbers

• Understanding irrational numbers

• Division of rational numbers

• Addition and subtraction of rational numbers

In Exercise 1, how is the age of the seventh grader calculated 3.5 years ago?

• By multiplying 12 by 3.5

• By subtracting 3.5 from 12

• By dividing 12 by 3.5

• By adding 3.5 to 12

What is the result of the calculation in Exercise 1?

• 10 years

• 7.5 years

• 8.5 years

• 9 years

In Exercise 2, what is the length of the arrow used to find the sum on the number line?

• 5 units

• 3 units

• 4 units

• 6 units

What is the final position on the number line in Exercise 2?

• 2

• 3.5

• 2.5

• 1.5

In Exercise 3, how is the subtraction problem rewritten?

• As a multiplication problem

• As a division problem

• As an addition problem

• As a subtraction problem

What is the direction of the arrow in Exercise 3 when adding a positive number?

• Down

• Right

• Up

• Left

What is the final answer in Exercise 3 after moving the arrow?

• 3.5

• 2.5

• 1.5

• 2

What is the sum of -1 and 4.3 as discussed in the conclusion?

• 3.3

• 2.3

• 1.3

• 4.3

How is the difference of 5.7 and 3 modeled on a number line?

• By moving 3 units to the right

• By moving 5.7 units to the left

• By moving 5.7 units to the right

• By moving 3 units to the left