a rational number is any number that CAN be written in the form a/b where b is not 0, and a and b are integers. So the denominator can be any integer (except 0) it does not have to be 100.
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Yes, -0.99 is a rational number because it can be written as a fraction, -99/100. A rational number is any number that can be expressed as a fraction with an integer numerator and a non-zero integer denominator.
Any real number can be the denominator in a fraction. A fraction is a way of expressing one number (the numerator, the "top" number in a fraction) by another (the denominator, "bottom number.") So it is possible to have a denominator of 100.
A fraction can have any number at all as its denominator, except zero.
Get the denominator to be 100.
0.21 is a rational number because it can be expressed as a fraction in the form of 21/100