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### How to Add Positive and Negative Numbers with the Same Sign

If you add a positive number with another positive number, the sum is always a positive number; if you add two negative numbers, the sum is always a negative number. So when you have an algebra problem [more…]

### How to Add Positive Numbers with Negative Numbers

When the signs of two numbers that you're adding are different, forget the signs and find the difference between the numbers — which is the difference between their absolute values. The number farther [more…]

### How to Subtract Positive and Negative Numbers

Subtracting positive and negative numbers is really easy to do: You *don’t!* Just change the minus sign (the one that's the operator) to a plus sign, change the number that the minus sign was in front of [more…]

### How to Multiply and Divide Positive and Negative Numbers

Multiplying and dividing positive and negative numbers is a simple operation with two numbers. With three or more, it is also straightforward, but you use the Even-Odd Rule. [more…]

### How Zero Affects Positive and Negative Numbers

It isn’t too tricky to perform operations using positive and negative numbers with zero. You follow normal addition and subtraction rules, and what zero does to the final sign depends on where the zero [more…]

### Basics of Positive and Negative Numbers

Positive and negative numbers are all integers. Integers are whole numbers that are either greater than zero (positive) or less than zero (negative). For every positive integer, there's a negative integer [more…]