Adding/Subtracting Integers

Adding/Subtracting Integers

Adding Integers rules

• If the signs are the same, add the numbers and keep the sign

• If the signs are different, subtract the numbers and keep the sign of the largest absolute value

Subtracting Integers rules

• Keep the first number the same, change the subtraction sign to addition, change the second number to its opposite

• Follow the Addition rules

Multiple Choice

Sandra has $32 in her purse. She pays $15 for a CD. Which expression represents this situation?

• 32 + 15

• -32 + 15

• -32 + (-15)

• 32 + (-15)

Multiple Choice

Chi is 38 feet underground touring a cavern. He goes down a ladder 7 feet. What is his new location?

• -45 feet

• -38 feet

• -31 feet

• -7 feet

Multiple Choice

The highest point in a state park is 145 feet above sea level. The lowest point is 28 feet below sea level. What is the difference in elevations?

• 117 feet

• 28 feet

• 145 feet

• 173 feet

Open Ended

What are your thoughts on adding and subtracting integers? Write a brief self-reflection.

Poll

On a scale of 0 - 2, rate yourself on adding and subtracting integers.

• 0 - I'm completely lost!

• 1 - I know some of it but not 100% confident

• 2 - I got everything correct, ready to move on!