2.3 adding integers 1 medina. negative number – a less than zero. 0123456-2-3-4-5-6 positive...
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2.3 Adding Integers
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Negative number – a number less than zero.
0 1 2 3 4 5 6-1-2-3-4-5-6
Positive number – a number greater than zero.
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Working with positive and negative numbers is like driving in traffic. You have to watch out for traffic signs and follow the driving rules.
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If you don’t see a negative sign in front of a number it is positive.
9+
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Rule #1 – If the signs are the same, pretend the signs aren’t there. Add the numbers and keep the sign.
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-3 + (-5) 4 + 7 3 + 4-6 + (-7 ) 5 + 9 -9 + (-9)
8
18 14
137
11+
-
-
-
+
+
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Rule #2 – If the signs are different pretend the signs aren’t there. Subtract the smaller from the larger one and keep the sign of the larger number.
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3 + (-5) -4 + 7 3 + (-4) -6 + 7 5 + (-9) -9 + 9
-25 – 3 = 2
0
-4
+1
-1
+3
9 – 9 = 0 9 – 5 = 47 – 6 = 1
4 – 3 = 17 – 4 = 3
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0 1 2 3 4 5 6-1-2-3-4-5-6
When the number is positive countto the right.
When the number is negative countto the left.
+-
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0 1 2 3 4 5 6-1-2-3-4-5-6+
-
3 + (-5) = -2
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0 1 2 3 4 5 6-1-2-3-4-5-6+
-
6 + (-4) = +2
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0 1 2 3 4 5 6-1-2-3-4-5-6-
+
-5 + 3 = -2
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