Transcript Subtracting Integers

9-6-11
Please start Bellwork #7
Have your Tuesday
Folder on your desk.
1-6 Subtracting Integers p.29
Subtracting Integers
When subtracting integers:
Change the subtraction sign to addition
Subtracting Integers
When subtracting integers:
Change the subtraction sign to addition
Change the sign of ONLY the next
number to its opposite.
Subtracting Integers
When subtracting integers:
Change the subtraction sign to addition
Change the sign of ONLY the next
number to its opposite.
Follow the rules for addition
EXAMPLE
14 – (-12)
14 – (-12)
14 – (-12)
Change the operation to addition
Change the next number to its opposite
Then follow the rules for addition. The signs
are now the same, so add and give the common
sign. 14 + 12 = 26.
EXAMPLE
 -28 – (-20) =
 -28 – (-20) =
 -28 – (-20) =
Change the operation to addition
Change the next number to its opposite
Now the signs are different, so find the difference (subtract)
and give the sign of the larger absolute value. 28 – 20 = 8.
-28 has a larger absolute value, it is negative so the answer to
the problem is negative. -28 – (-20) = -8
TRY THIS
32 – (-3) =
-40 – 66 =
2 – 48 =
TRY THIS
32 – (-3) =
-40 – 66 =
2 – 48 =
35
TRY THIS
32 – (-3) =
35
-40 – 66 =
-106
2 – 48 =
TRY THIS
32 – (-3) =
35
-40 – 66 =
-106
2 – 48 =
-46
WORKSHEET ANSWERS
1) -12 2) 19
5) 2
6) 1
9) 62 10) 82
13) 7
15) -4
17) 11
19) 16
3) -17
7) -17
11) -24
14) -3
16) -9
18) -10
20) -33
4) -16
8) -21
12) 0
Agenda 9-6-11
p.31
#20-37
*38 – 74 optional
9-7-11
Please start Bellwork #8
Have your HW, book,
red pen, pencil on your
desk.
Modeling Integers
Yellow chips = positive numbers
Red chips = negative numbers
Use a mat to show each addend.
Write your answers with a picture and final
answer.
Use zero pairs to remove chips from the
mat. (one yellow and one red)
P.23 Example 1: 2 + (-5) = -3
-1 + 4 =
7 + (-3) =
-2 + (-2) =
P.29 Example 1: -6 – (-2) = -4
-7 – (-2) =
-4 – (-3) =
-8 – (-5) =
Agenda 9-7-11
Workbook p.6
Chapter 1 Test
next week
9-7-10
Please have your
homework, book, and
red pen on your desk.
Start working on
Bellwork #5 (write on
own paper)
Agenda 9-7-10
PA#8:
Worksheet
pp.5-6