Understanding Addition and Subtraction of Integers

Mr. Wooley introduces middle school students to the concept of subtracting integers and rational numbers. The lesson uses number lines to visualize subtraction as adding the opposite. Through examples and word problems, students learn to convert subtraction into addition of the additive inverse. The video concludes with practice problems to reinforce the concepts taught.

What is the result of adding 4 and 2 on a number line?

• 8

• 2

• 4

• 6

How does subtracting a positive number affect the value on a number line?

• Moves to the right

• Doubles the value

• Moves to the left

• Stays the same

What happens when you subtract a negative number?

• It doubles the value

• It increases the value

• It decreases the value

• It has no effect

How can you express 8 minus 2 using addition?

• 8 + 2

• 8 + (-2)

• 8 - (-2)

• 8 - 2

What is the result of 11 minus negative 8?

• 11

• 19

• 3

• 8

In a card game, if you discard a negative card, what happens to your score?

• It stays the same

• It doubles

• It decreases

• It increases

What is the equivalent expression for 25,000 minus negative 600?

• 25,000 + 600

• 25,000 - 600

• 25,000 + (-600)

• 25,000 - (-600)

How do you find the difference in elevation between a plane at 26,000 feet and a submarine at 700 feet below sea level?

• Subtract 700 from 26,000

• Add 700 to 26,000

• Add 26,000 to 700

• Subtract 26,000 from 700

What is the result of 18 plus negative 26?

• 44

• -44

• -8

• 8

If you have more positive numbers than negative numbers, what will be the sign of the result?

• Undefined

• Zero

• Negative

• Positive