Integer Operations and Models

• -4 x 4 = -16
• 16 ÷ -4 = -4
• -4 x -4 = -16
• -16 ÷ -4 = -4

• -4
• 10
• 3
• 4

• 1
• -1
• 7
• -7

• (-10) - 10 = -20
• (-10) + 10 = 0
• (-20) + 0 = -20
• 10 - 10 = 0

Jason stopped at the grocery store on his way home from work. He used his debit card to purchase 2 salads for $7 each, 3 bottles of soda for $2 each, and a sandwich for $8. The change in the balance of Jason's checking account is represented by the expression below. What integer represents the change in the balance of Jason's checking account?

Mathematical Equivalence

ON

If I am subtracting integers, I need to change the problem to addition by ​ ​ (a)   ​ the ​ (b)   ​

• opposite

• subtracting

• same sign

• adding

Match the following

• -8

• 1 - 5

• 2

• -4 - (-6)

• 13

• 10 - 9

• -4

• -7 + (-1)

• 1

• 8 - (-5)

The price of jeans was reduced $6 per week for 7 weeks.  By how much did the price of the jeans change over the 7 weeks?

• 42

• -42

• 20

• -20

Match the following with the correct operation and sign of the answer.

• subtract, negative

• -717 + 927

• add, positive

• -762 + (-481)

• add, negative

• -1239 + 904

• subtract, positive

• 3 + 5

A submarine is submerged at 20 feet below the surface. The submarine is now  descending at a rate of 120 feet per minute. Which integer represents the position of the submarine after 3 minutes?

• • -20 feet below the surface

• -380 feet below the surface

• -360 feet below the surface