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Adding Integers |
| Objective: add integers |
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Vocabulary: additive inverse, zero pair, integers, addends, additive identity |
| Integers is another name for the whole numbers and their opposites: Example (. . . . -3, -2, -1, 0, 1, 2, 3, . . ) Each negative integer has a positive opposite and each positive integer has a negative opposite. Example positive 3 negative opposite -3 |
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| 1. A dd the positive
integers.
If both integers are positive, just add the numbers. Example: 7 + 11 = Add the integers 7 + 11 = 18 7 + 11 = +18 Use the sign of the numbers
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2. If both
integers are negative, then add the negative integers
without the signs. The answer will be negative.
Example: -7 + (-11) = Add the integers 7 + 11 = 18 -7 + (-11) = -18 Use the sign of the number
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| 3. If one integer is
negative and one integer is positive, subtract the two numbers. The answer
will be the sign of the larger absolute value.
Example: -7 + 11 = Subtract the two numbers 11 - 3 = 4 - 7 + 11 = +4 Use the sign of the larger number's absolute value |
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If there is no sign in front of the number it is understood to be positive. |
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Practice |
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1. 2 + 4 = |
2. -7 + -3 = |
3. -3 + 4 = |
4. 23 + (-12) = |
5. 98 + (-15) = |
| Remember: When the signs are the same ( +,+ or -,-) you add and use the sign in front of the numbers for the answer. When the signs are different ( +, - or -,+) you subtract and take the sign of the number with the larger absolute value. |
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| 1. 6 | 2. - 10 | 3. + 1 | 4. + 11 | 5. + 83 |
