Subtraction and Rational Numbers Concepts

Mrs. Lopez teaches a lesson on addition and subtraction of rational numbers, including mixed numbers, decimals, and fractions. The lesson covers rules for operations, uses number lines for visualization, and includes exercises to apply these concepts. Real-world applications are discussed, and students are encouraged to review the material for better understanding.

What are rational numbers composed of?

• Only positive integers

• Only negative integers

• Positive and negative mixed numbers, decimals, and fractions

• Whole numbers and decimals

How do you represent subtraction on a number line?

• By moving to the right

• By moving to the left

• By drawing a circle

• By changing subtraction to addition of the opposite

What is the result of adding negative 2 and 1/2 to 5 on a number line?

• 3

• 2 and 1/2

• Negative 2 and 1/2

• 7 and 1/2

When subtracting fractions, what is a necessary step?

• Converting fractions to decimals

• Finding a common denominator

• Ignoring the fractions

• Adding the fractions directly

What is the first step in solving a subtraction problem without a number line?

• Multiply the numbers

• Convert subtraction to addition of the opposite

• Add the numbers directly

• Divide the numbers

How do you handle a subtraction problem involving decimals?

• Add instead of subtract

• Convert to fractions first

• Align the decimal points and subtract

• Ignore the decimal point

What is the result of 7 minus negative 9/10?

• 7.9

• 6.1

• 6.9

• 8.1

If Samantha owes $7 and pays $5.50, how much does she still owe?

• $3.00

• $1.50

• $0.50

• $2.00

In a real-life scenario, if a car starts with 12 gallons and uses 10 and 1/8 gallons, how much is left?

• 1 and 7/8 gallons

• 2 gallons

• 1 gallon

• 3 gallons

What is the position of a fish that moves 3 and 1/2 feet below the surface and then 5 and 1/4 feet more?

• 8 feet below

• 7 feet below

• 9 feet below

• 8 and 3/4 feet below