9.1 = 91/10 a ratio of two integers. So 9.1 is a rational number.
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It is: (4.5+4.6)/2 = 4.55 and because it is a rational number it can be expressed as a fraction in its simplest form of 91/20
There are infinitely many rational numbers between them. One example is 9.00000000000246064000000002
i thing o.91 is irrational because irrational number can not be written as a fraction they can only be written as numbers with Decimals
yes
Yes.