To get a negative number you need a negative number and a positive number. The rule works the same when you need to multiply or divide more than two numbers. An even number of negative numbers gives a positive answer. An odd number of negative numbers gives a negative result.
What is the rule for adding and subtracting negative numbers?
| Rule | Example | |
|---|---|---|
| +(+) | Two equal signs become a positive sign | 3+(+2) = 3 + 2 = 5 |
| −(−) td > | 6−(−3) = 6 + 3 = 9 | |
| +(−) | Two different signs become a negative sign | 7+(−2) = 7 − 2 = 5 |
| −(+) | 8−(+2) = 8 − 2 = 6 |
What are the rules for negative and positive?
There are two simple rules to remember: When you multiply a negative number by a positive number, the product is always negative. When you multiply two negative numbers or two positive numbers, the product is always positive.
Why is 2 minus a plus?
When a number is positive, the + in front of the number is usually omitted. So 3 is really (+3). Adding and multiplying combinations of positive and negative numbers can be confusing, so caution is advised. Two plus is plus, two minus is plus.
What is the rule for adding negative real numbers?
If the two numbers you are adding are negative, you will get a negative answer. Example 1: Add 6 + (8). The sum of the absolute values would be 14 and their common sign is .
Why does a negative multiplied by a negative result in a positive?
Given that multiplication is commutative, a negative multiplication by a positive one is also negative. Likewise, we can prove that a negative multiplied by a negative is a positive. Since we know that −ab is negative and the sum of these two terms is 0, (−a) × (−b) is positive.
What happens when you subtract a negative from a positive?
Rule 4: Subtract a negative number from a positive number – when you see the subtraction sign (minus sign) followed by a negative sign, convert both signs to a plus sign. So instead of subtracting a minus, you add a plus, so you have a simple addition problem.
What is the rule for adding and subtracting?
1) If the two numbers have different signs like positive and negative, subtract the two numbers and give the sign of the larger number. 2) If the two numbers have the same sign, i.e. positive or negative, add the two numbers and state the common sign.
What is a negative number and a positive number?
Positive numbers are all numbers greater than zero, for example: 1, 2.9, 3.14159, 40000, and 0.0005. … Negative numbers are less than zero (see the number line for a more detailed explanation). Likewise, the opposite of any negative number is a positive number. For example, the opposite of 12.3 is 12.3.
Do 2 negatives make a positive?
If you have two negative signs, one flips and they add up to a positive sign. If you have a positive and a negative result, a dash remains and the answer is negative.
What is the quotient of two negative numbers?
RULE 1: The quotient of a positive integer and a negative integer is negative. RULE 2: The quotient of two positive integers is positive. RULE 3: The quotient of two negative integers is positive. If the signs are different, the answer is negative.