Transcript Subtracting Integers

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Objective
To subtract integers
Vocabulary
None
Subtraction Rule # 1
4 - 7
4 + -7
Separate numbers with sign in front
of number
Place a positive sign between them,
then follow the addition rules
Subtraction Rule # 2
4 - (-7)
Combine the 2 negative signs to
make a positive
4 + 7
Follow the addition rules
Example 1 Subtract a Positive Integer
Example 2 Subtract a Positive Integer
Example 3 Subtract a Negative Integer
Example 4 Subtract a Negative Integer
Example 5 Evaluate Algebraic Expressions
Example 6 Evaluate Algebraic Expressions
Find
2 - 6
2 + - 6
Different
Write problem
Separate numbers with sign in
front of number
Place a positive sign between them,
then follow the addition rules
Draw arrows to the signs
Determine if the signs are
the same or different
1/6
Find
2 - 6
2 + - 6
Different
Different signs, subtract the
numbers without the signs
6-2
(Remember: big number small number)
Keep sign of largest number
which is negative
-4
Answer: - 4
1/6
Find
Answer: - 4
1/6
Find
-7 - 5
-7 + -5
Same
Write problem
Separate numbers with sign in
front of number
Place a positive sign between them,
then follow the addition rules
Draw arrows to the signs
Determine if the signs are
the same or different
2/6
Find
-7 - 5
Same sign, add the numbers
without the signs 7 + 5
Keep the sign which is -
-7 + -5
Same
- 12
Answer: - 12
2/6
Find
Answer: - 8
2/6
Write problem
Find
11 - ( - 8 )
11 + 8
Same
19
Answer: 19
Combine the negative signs and
make a positive sign
Draw arrows to the signs
Determine if the signs are
the same or different
Same sign, add the numbers
without the signs 11 + 8
Keep the sign which is +
3/6
Find
Answer: 18
3/6
Write problem
Find
-6 - (-9)
-6 + 9
Different
Combine the negative signs and
make a positive sign
Draw arrows to the signs
Determine if the signs are
the same or different
4/6
Different signs, subtract the
numbers without the signs
9 - 6
Find
-6 - (-9)
(Remember: big number small number)
-6 + 9
Different
Keep sign of largest number
which is negative
3
Answer: 3
4/6
Find
Answer: 4
4/6
Evaluate
12 - r
Write problem
12 - ( - 7 )
Bring down 12 -
12 + 7
Replace r with - 7
Same
Combine the negative signs and
make a positive sign
Draw arrows to the signs
Determine if the signs are
the same or different
5/6
Evaluate
12 - r
12 - ( - 7 )
12 + 7
Same sign, add the numbers
without the signs 12 + 7
Keep the sign which is +
Same
19
Answer: 19
5/6
Evaluate
Answer: 12
5/6
Evaluate
q - p
Write problem
-3 - 6
Replace q with - 3
-3 + - 6
Bring down the - sign
Replace p with 6
Separate numbers with sign in
front of number
Place a positive sign between them,
then follow the addition rules
6/6
Evaluate
q - p
Draw arrows to the signs
-3 - 6
Determine if the signs are
the same or different
-3 + - 6
Same
-9
Same sign, add the numbers
without the signs 3 + 6
Keep the sign which is -
Answer: - 9
6/6
*
Evaluate
Answer: - 9
6/6
Assignment
Lesson 1:5 Subtracting Integers
12 - 41 All