What am I Learning Today?

1
What am I Learning Today?

• Integers

How will I show that I learned it?
Subtract positive and negative integers
accurately
2
QUESTION

• How do I subtract integers?

3

• Use the additive inverse
• Change the subtraction sign to addition
• Change the second number to its opposite
• Follow the addition rules

9 (- 5)
9 5 14
4
Solve These Problems

• 3 (-5)
• -4 (-7)
• 3 - 4
• -6 - 7
• 5 (-9)
• -9 (-9)

8
3 5
3
-4 7
-1
3 (-4)
-13
-6 (-7)
14
5 9
0
-9 9
5
Lets Try a Word Problem
On January 1, 2002, the high temperature was
81F in Kona, Hawaii. The low temperature was
-29F in Barrow, Alaska. What was the difference
between the two temperatures?
110F
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Lets Try a Few More Challenging Ones 1. 16
(-13) (-5) 2. 7 (-2) - 9 3. 1.8
(-3.7) 4. -0.8 (-7.2) 5.4 5. 6.

34
-14
5.5
-13.4
7

• And Now Try These.
• 1. 2 6 3 - (4)
• 2. 7 - (5) - 3 - (4)
• 6.8 - (1.9) 7.6 1
• -1/2 - (-2/3) - 1/3 - (3 ¾)

-9
13
-13.4
8
Lets SUM it up

• Keep it, change it, flip it??
• Keep the first number the same
• Change the operation to addition
• Flip the number to the other side of the number
  line (use its opposite)
• SUBTRACTION means add the opposite