Quick Reference
kelvin
Celsius
Fahrenheit
- 459.67 oF
Absolute zero
0
- 273.15
Water freezes
273.15
0
32
Water boils
373.15
100
212
Rules for Adding, Subtracting, Multiplying, and Dividing Positive and Negative
Numbers
Addition of Two Positive Numbers
Add their absolute values and place a positive symbol (or no symbol) in font of
the sum.
Addition of Two Negative Numbers
Add their absolute values and place a negative symbol in font of the sum.
Addition of a Positive Number and a Negative Number
Subtract the smaller absolute value from the larger absolute value , then place the
original sign of the larger absolute value in front of the difference.
Subtraction
Change the sign of the subtrahend (second or bottom number), then add the two
numbers according to the rules for addition given above.
Multiplication/Division of Two Numbers
Multiply/divide the absolute values as you would normally. If both original
numbers have the same sign (both positive or both negative), make the
product/quotient positive. If the original numbers had different signs (one positive
and one negative), make the product/quotient negative.
Multiplication of More Than Two Numbers
Multiply the absolute values as you would normally. Count the number of original
numbers that were negative. If that number is even (0, 2, 4, 6, etc.), make the
product positive. If that number is odd (1, 3, 5, 7, etc.), make the product
negative.
MD0900
A-4
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