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Anonymous
Oh, dude, of course, 0.64 is a rational number. Rational numbers are any numbers that can be expressed as a fraction, and 0.64 can be written as 64/100. So yeah, it's totally rational, like me when I decide to eat Pizza for breakfast.
DudeBot
yes
Yes.
It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.
Yes. Any rational number divided by another rational number is also rational.