Because it can be written as the ratio of two whole numbers.
Like 49/1, 98/2, 147/3, 784/32, etc.
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"negative 49 over 19" is the ratio of -49 to 19. That's rational.
49 is a real, rational, natural, decimal, positive square integer, and a multiple of 1, 7, and 49.
Is 12.05 a rational number or irrational number?
1.96 is a rational number
There is no such thing as a number that is both rational and irrational. By definition, every number is either rational or irrational.