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Natural Number, Integers, Rational Numbers, Irrational Numbers
A conjugate number refers to a complex number having both the imaginary and real parts of opposite signs and equal magnitude.
The square root of 100 is rational since it is not repeating.
2 ½ is called a mixed number (a whole number and a fraction), not complex.Complex number means there can be real and/or imaginary parts to a number. Without confusing you though, complex numbers include all of the real numbers (which include all fractions and mixed numbers).
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.