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An integer is a number that can be written without a fractional component. For example, 21, 4, 0, and −2048 are integers, while 9.75, 5 1⁄2, and √2 are not.
To add two integers with the same signs add their absolute values and select their common sign. For example,
1 + 2 =3, (-1 ) + ( -2) = -3
To add two integers with the opposite signs, take a bigger absolute value, subtract a smaller absolute value and select a sign of bigger absolute. For example,
-3 + 5 = 2, 3 + ( -5 ) = - 2
To subtract a positive integer means to add a negative integer. Instead of saying " Nine minus twelve" say "Nine minus Twelve" and then use the rule of adding integers with the opposite signs.
9 - 12 = 9 + ( -12) = -3
Instead of saying " Negative six minus eight" say negative plus negative eight and then use the rule of adding integers with the same signs.
- 6 -8 = -6 + (-8) = -14
Look at the following example;
a) -8 -12
Translate to addition: ( -8) + (-12)
Add two integers with the same signs: - 20
Thus, - 8 -12 = -20
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Mar 18, 2017
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