Scott at also has put together a handy video on how to create a cheat sheet for multiplying negative and positive numbers (scroll down the page and you’ll find the video). Change the subtraction sign to addition and change the sign that follows to its opposite. If you’re still confused over why a negative number times a negative number makes a positive number, Diana Brown at the Department of Mathematics, the University of Georgia, explains it in many different ways in this article. Subtracting positive and negative numbers means that you add the opposite numbers, or additive inverse. Here’s the overall rule to remember when multiplying positive and negative numbers: 2 x -4 are both negative, so we know the answer is going to be positive. If you look at it on the number line, walking backwards while facing in the negative direction, you move in the positive direction.įor example. Two negatives make a positive, so a negative number times a negative number makes a positive number. Adding two negative numbers yields a negative number. Rule 3: A negative number times a negative number, equals a positive number. Adding and Subtracting Negative Numbers Adding two positive numbers yields a positive number. It doesn’t matter which order the positive and negative numbers are in that you are multiplying, the answer is always a negative number.įor example: -2 x 4, which in essence is the same as -2 + (-2) + (-2) + (-2)Īnd as we said, if it’s the other way around 4 x -2, the answer is still the same: -8. When you multiply a negative number to a positive number, your answer is a negative number. Rule 2: A negative number times a positive number equals a negative number. 5 is a positive number, 3 is a positive number and multiplying equals a positive number: 15. In the Addition of One positive and another negative integer, the higher absolute value of the two integers will determine the sign. The addition of 2 negative integers will always result in a negative integer. This is the multiplication you have been doing all along, positive numbers times positive numbers equal positive numbers.įor example, 5 x 3 = 15. The addition of 2 positive integers will always result in a positive integer. There are only three rules to remember: Rule 1: A positive number times a positive number equals a positive number. Add and subtract negative numbers, and see how absolute value can be used to find the distance between any two numbers on the number line. There are less rules when multiplying positive and negative numbers than in adding and subtracting positive and negative numbers. Addition & subtraction: find the missing value (part 1 of 2) Addition & subtraction: find the missing value (part 2 of 2) Addition & subtraction: find the missing value.
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