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x + 1 = 4
x - 5 = 10
x + 2 = 1
x + 0 = 0
... the study of mathematical symbols and the rules for manipulating these symbols; it is a unifying thread of almost all of mathematics.
operations that undo each other
an alphabetic character representing a number, called the value, which is either arbitrary or not fully specified or unknown. It is usually a letter like x or y.
A number without a variable
The set of whole numbers and their opposites.
a part of a whole
Any number that can be expressed as a ratio of two integers. Example; 6 can be expressed as 6/1, and 0.5 as 1/2.
inverse (opposite) operation
Operations that do the exact opposite of each other; they undo each other (addition and subtraction, for example)
A mathematical sentence that contains an equals sign
A mathematical phrase without an equal sign.
a + (-a) = 0 = (-a) + a OR a * 1/a = 1 = 1/a * a; a cant be 0
A mathematical phrase that contains variable, numbers, and operation symbols
change from one form into another
the decimal part
A value that does not change
multiply a sum by multiplying each addend separately and then add the products
A number, a variable, or the product of a number and a variable
expressions that contain the same variables to the same power