An even number of negative numbers will give a positive answer. An odd number of negative numbers will give a negative answer. When adding signed numbers, it is useful to think of positive numbers as gains and negative numbers as losses. The rule works the same way when you have more than 2 numbers to divide or multiply. While it’s true that a negative times a negative is a positive, a negative plus a negative is actually a negative. To get a negative number, you need 1 positive & 1 negative number. Positive numbers can technically be indicated using a +, but by convention, positive numbers are written without the plus sign in front of them. You cannot multiply a number by itself to get a negative number. The two negatives cancel each other out, because negative negative would just be another positive. (negative number) × (positive number) = negative number (positive number) × (positive number) = positive number (negative number) × (negative number) = positive number So for consistency the next product in the pattern must be 0 3 3. Notice in each case, as we reduce the second factor by 1, the product is being reduced by 3. That is, we like to believe that basic laws such as a × b b × a a × b b × a and a × 1 a a × 1 a and a × 0 0 a × 0 0 hold. You take the number with the higher absolute values sign then subtract. First, to establish that a positive times a negative is negative: 3 × 2 6, 3 × 1 3, 3 × 0 0. 1.5 Why is NEGATIVE TIMES NEGATIVE POSITIVE When we discover negative numbers we naturally, without question even, assume they obey the same laws of arithmetic as the ordinary positive counting numbers. When the signs of the 2 numbers are the same, the answer will be positive. A negative plus a negative equals a higher negative. When the signs of the 2 numbers are different, the answer will be negative. Two Negatives make a Positive Multiplying & Dividing Positive & Negative Numbersįirst, ignore the signs, multiply or divide the numbers as if they were both positive.Īfter you have the numerical answer, apply a very simple rule to decide the sign of the answer: Causes of a Negative Pregnancy Test with No Period Overview. Subtracting a Negative is the same as adding!
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