Bell RingersOn a loose leaf piece of paper complete the following bell ringers. 1. (-56) + 32 + (-17)2. 23 + 148+ (-35)3. Nemo is swimming 78 feet below sea level. He chases Dory in a game of tag 46 feet deeper. Then they rise 52 feet. At what elevation are Nemo and Dory swimming. 4. Write a real world problem to show the additive inverse of 96.

Subtraction of Integers 1

Today I will be able to subtract integers given an equation.

What is subtraction of integers

When we talk about the difference between two integers we are looking at how far they are apart from each other on a number line. (-6) – (-2)=

3 – 2 =

(-4) – 1 =

1 – (-3) =

(-3 ) – (-1) =

What happened when there was a

subtraction sign and a negative sign?

Rule of Subtractionsubtracting a number is the same as adding its additive inverse(or opposite). Ex: 4 – 3 = 1 is the same as 4 + (-3) = 1

(-5) – 2 = (-7) is the same as

(-5) + (-2) =(-7)

Let’s PracticeCopy the following problem and steps in your journal as I model.

Solve: 8 -12 =

Step one: Change the subtraction sign to addition (rule of subtraction) Ex: 8 + 12Step two: Change the positive 12 to a negative 12 (rule of subtraction) Ex: 8 + (-12)Step three: follow the directions of the addition of integers song. (Same signs add and keep. Different signs subtract. Keep the sign of the larger number, then you’ll be exact.Ex: 12 - 8 = 4. 12 is the larger number and 12 is negative so the answer will be negative.

Solve using the subtraction rule

4 – (-2) = Step 1:Step 2:Step 3:

Your Turn• Solve this equation on your whiteboard.

Show your work.

8 – 2 =

Your Turn• Solve this equation on your whiteboard.

Show your work.

4 – 9 =

Your Turn• Solve this equation on your whiteboard.

Show your work.

(-3) – 7 =

Your Turn• Solve this equation on your whiteboard.

Show your work.

(-9) – (-2) =

Your Turn• Solve this equation on your whiteboard.

Show your work.

11 – (-8) =

Your Turn• Solve this equation on your whiteboard.

Show your work.

(-10) – (-4) =

Real World ProblemsClue words that tell me when to subtract: Difference, minus, take away , fewer than , less than , decreased by , are not , change.

When reading word problems you look for these clue words when writing your equation.

Watch me solve thisI have 243 dollars in my bank account. I owe the credit card company 156 dollars. What is the difference between the money I have in my bank account and the money I owe?

Equation:

Let’s solve this together

An airplane flies at an altitude of 25,000 feet. A submarine dives to a depth of 600 feet below sea level. What is the difference in elevation between the airplane and submarine.

Equation:

Your TurnThe Enterprise water station have 365,410 gallons of water. Dothan water station has borrowed 23,168 gallons of water. How much less water does the Dothan water station have compared to the Enterprise water station?

Equation:

Exit TicketSolve the following 1. If a player had the following cards, what is the value of his

hand?

2. Identify two different ways the player could get to a score of 5 by adding or removing only one card. Explain.

3. Write two equations for part number 2, one for each of the methods you came up with for arriving at a score of 5.

4. Using the rule of subtraction, rewrite the following subtraction expressions as addition expressions and find the sums.

A. 5−9=

B. (−14)−(−2)=

C. (-13) – 6=