Warm up 1. 8 + (-3) = 2. -18 – (-8) = 3. -13 - 7 = 4. 24 – (-4)=

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Presentation transcript:

Warm up 1. 8 + (-3) = 2. -18 – (-8) = 3. -13 - 7 = 4. 24 – (-4)=

Adding and Subtracting Integers

Adding Integers If the signs are the same, ADD the numbers and give the sum the same sign. Example: 2 + 23 = 25 -2 + -23 = -25

Adding Integers When adding a negative number with a positive you have three options!!!! Counters Number Line Score board

NUMBER LINE Answer +3

Score Board -4 + 7 = Who won?? By how much?? Answer is Positive Team (+) Negative Team (-) Who won?? By how much?? Answer is

Three Steps (KCC) 1. Keep 2. Change 3. Change (Opposite) SUBTRACTION Three Steps (KCC) 1. Keep 2. Change 3. Change (Opposite)

Subtraction (3-Steps) -3 – (-4) -3 + (+4) 1. KEEP THE FIRST NUMBER THE SAME 2. CHANGE the (-) to a (+) 3. CHANGE the second number to the (opposite) -3 – (-4) -3 + (+4)

Practice 1) -24 – 11 = 4) -16 – (-14) = 2) 18 + (-40) = 5) 13 – 35 = 3) -9 – 9 = 6) -29 + 65 =

The Houston Texans lost 7 yards on one play and then gained 12 yards on the next play. What was the total number of yards gained or lost? On Friday Rosa borrowed $10 from her sister. The next day she paid back $5. Then on Monday she borrowed $4 more. How much does Rosa owe?

3) Roger owes his mom $5. He borrows another $6 from her 3) Roger owes his mom $5. He borrows another $6 from her. How much does he owe her now? 4) A roller coaster begins at 90 feet above ground level. Then it descends 105 feet. Find the height of the coaster after the first descent.

Exit Ticket -5 + 15 = 8 – (-3) = -2 – 6 = Answer the following questions. SHOW YOUR WORK!!! (using score board or number line) -5 + 15 = 8 – (-3) = -2 – 6 =