Understanding Addition and Subtraction of Rational Numbers

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