Number operation review 3 pot

Rules for Working with Positive and Negative Integers

Multiplying/Dividing

■ When multiplying or dividing two integers, if the signs are the same, the result is positive.

Examples

negative  positive negative 3  5 15

positive  positive positive 15  5 3

negative  negative positive 3  5 15

negative  negative positive 15  5 3

■ When multiplying or dividing two integers, if the signs are different, the result is negative:

Examples

positive  negative negative 3  5 15

positive  negative negative 15  5 3

Adding

■ When adding two integers with the same sign, the sum has the same sign as the addends.

Examples

positive  positive positive 4  3 7

negative  negative negative 4  3 7

■ When adding integers of different signs, follow this two-step process:

1. Subtract the absolute values of the numbers. Be sure to subtract the lesser absolute value from the greater

absolute value.

2. Apply the sign of the larger number

Examples

2  6

First subtract the absolute values of the numbers: |6|  |2| 6  2 4

Then apply the sign of the larger number: 6.

The answer is 4.

7  12

First subtract the absolute values of the numbers: |12|  |7| 12  7 5

Then apply the sign of the larger number: 12.

The answer is 5.

–NUMBERS AND OPERATIONS REVIEW–

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