Yes.
2⅓ = (3×2+1)/3 = 7/3 which is of the form of one integer over another which is the form of rational numbers.
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Yes, -1/2 is a rational number
A rational number is one where a whole number is over another whole number. 3 and 2 are both whole numbers so 3/2 is a rational number.
A rational number is a number which can be expressed as the quotient of two integers, a quotient being the solution to a division sum. Therefore, 1/2, or one half, is a rational number, equal to 0.5. However, 1/3, or one third, is an irrational number, because if you had to write the number out as a decimal, the number would continue to recur. Therefore, all integers are rational numbers, but not all rational numbers are integers. EDIT: 1/3 is a rational number, whoever said it wasn't is a moron.
It is a rational number. One way this can be proved is that it can be represented as a fraction: 7/2.
The given whole number of -2 is a rational number