Monday, March 10, 2008
math sori late na ha? ngayon ko lang naisip gawin ehh
Adding and subtracting
Here's how to add a positive integer to a negative integer:
-3 + 6 = ?
If you start at negative three on the real number line and move six units to the right, you end up at positive three. Also, these integers have different signs,
so keep the sign from the integer having the greatest absolute value and subtract the smallest absolute value from the largest.
Subtract three from six and keep the positive sign, again giving positive three.
Adding and subtracting
Here's how to add a negative integer to a positive integer:
5 + (-8) = ?
If you start at positive five on the real number line and move eight units to the left, you end up at negative three. Also, these integers have different signs, so keep the sign from the integer having the greatest absolute value and subtract the smallest absolute value from the largest, or subtract five from eight and keep the negative sign, again giving negative three.
Adding and subtracting
To subtract a number, add its opposite:
5 - 8 = ?
Because they give the same result, you can see that subtracting eight from five is equivalent to adding negative eight to positive five. The answer is - 3.
To subtract a number, add its opposite:
-3 - (-6) = ?
Because they give the same result, you can see that subtracting negative six from negative three is equivalent to adding positive six to negative three. The answer is 3.
Dividing and Multiplying
You multiply or divide integers just as you do whole numbers, except you must keep track of the signs. To multiply or divide signed integers, always multiply or divide the absolute values and use these rules to determine the sign of the answer.
When you multiply two integers with the same signs, the result is always positive. Just multiply the absolute values and make the answer positive.
Positive x positive = positive Negative x negative = positive
Dividing and Multiplying
When you multiply two integers with different signs, the result is always negative. Just multiply the absolute values and make the answer negative.
Positive x negative = negative
Negative x positive = negative
When you divide two integers with the same sign, the result is always positive. Just divide the absolute values and make the answer positive.
Positive ÷ positive = positiveNegative ÷ negative = positive
Dividing and Multiplying
When you divide two integers with different signs, the result is always negative. Just divide the absolute values and make the answer negative.
Positive ÷ negative = negative
Negative ÷ positive = negative
just search on http://math.com
