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An "expression", is part of a number sentence that combines numbers and operation signs but does not have an equal sign" Example: x/y , when x=10 and y=5 , the assumption of this expresssion is 10/5 or 2. Or: 2+3 , the assumption of this expression is 5 even though no equal sign is present. Lyle Larson 4th grade Southern California
A mathematical sentence that contains an equals sign would be called an equation.
1.5 is a mixed number and there is no way to represent it as a whole number. The whole part of it is 1.
A fraction is part of a whole number and it comes from a Latin word meaning broken part.
A complex number comes in two parts: a real part and an imaginary part. If the value of the real part is a and the value of the imaginary part is b, the number is written as a + bi.