Title: What am I Learning Today?
1What am I Learning Today?
How will I show that I learned it?
Subtract positive and negative integers
accurately
2Hands On Investigation
- 1
- -1
- 0 (ZERO PAIR)
- When you model subtracting numbers with the same
sign, you simply take away chips to find the
difference. - When you model subtracting numbers with different
signs, you need to add zero pairs before you can
take away chips.
3QUESTION
- How do I subtract integers?
4- 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
5Solve 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
6Lets 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
http//my.hrw.com/math06_07/teacher/osp/msm2_ga/da
ta/chap02/section03/practice_b.pdf
7Lets Try a Few More 1. 2 6 2. 3 -
(4) 3. 7 - (5) 4. 3 - (4) 5. 6 -
(1) 6. 6 - 1
-8
1
12
7
-5
-7
8Lets 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