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Here are some: 5, -2, 1/3, square root of 27, pi.
The set of real numbers is a subset of the set of complex numbers. Any complex number can be represented in the form (a + bi), where a & b can be any real number, and i is the imaginary unit equal to sqrt(-1). So if b = 0, then we have just a, which is a real number.
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How is a percent a real number?
It need not be. For example, a complex number as a percent of most other complex numbers, or any real number, will not be a real number.
What isn't a real number?
A complex number for example. Complex numbers involve i, the imaginary square root of -1.
Can a number be real and complex?
Yes. If the number is like, for example, 3+0i, then you'll figure out that the number, though is written as a complex number, is actually a real number 'cause 0i=0 and 3+0=3 so you have both real and complex number. Every number is a complex number, no matter if it's imaginary or real or a combination of both (a+bi).
Is every complex number a pure imaginary number?
No. For example the number 1+i. Pure imaginary complex numbers are of the form 0 + a*i, where a is a non-zero real number.
Is -4 a nonreal complex number?
No. Negative four is a real number. All real numbers are also complex numbers, so it is a complex number (but it's real, not nonreal)
