TA 1.6 Subtracting Integers 2014.notebook
September 19, 2016
1.6 How do we use the additive inverse to subtract Integers?
Warm-up
2.
1. -5+8+(-3)
3.
-X + |Y+-10|
4.
-212 + -45
Homework Questions
|-12+8|
IF X= -3 AND Y= 5
5.
98 + -112
Adding negative number
1. What do you have more of?
2. How many more do you have?
Consider the Following
5-3
5+(-3)
pos +pos = pos
neg + neg = neg.
pos + neg= pos/neg <­subtract
How do we subtract Integers?
Subtraction goes with the number that follows it.
Steps to subtraction:
1. ** change all subtraction into adding the opposite. **
Ex 3: 3 - (-4) - 2 + 8
Ex 4: 15 - (-4)
Ex 5: |-3 -9| + 13
Ex 6: -x - 15 - y
Additive Inverse
2. Use the rules for adding integers
a - b = a + -b
Ex 1: -4 - 3
x = 10 and y = -20
Ex 2: 10 - 11
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TA 1.6 Subtracting Integers 2014.notebook
Ex. 7: Eruptions cause volcanos to grow. In 1962, the
summit elevation of Kick-'em-Jenny was -235 meters. In
2002, the summit elevation was -182 meters. By how
many meters did the elevation of the volcano change?
September 19, 2016
You Try:
1. -6 - 30
2. 52 - (-6)
3. -36 - 15 + 36
4. -a - b + |a + b|
a = -5 and b = 6
Ex 8: At 7:00 pm, the temperature was 27 degrees. By
2:00 am, the temperature dropped down to -12 degrees.
What was the change in temperature?
Practice Sheet 1.5-1.6
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