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Given a rational number, express it in the form of a ratio. You can then calculate equivalent rational fractions if you multiply both, its numerator and denominator, by any non-zero integer.

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Q: How do you find equivalent rational number s?
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What s happens when rational numbers are multplied?

The product of two rational numbers is always a rational number.


What is a real number that is not rational a natural number or an integer?

no # all numbers are real #'s


How can a number line be used to compare rational numbers?

because the # line shows the rational #'s in order from least to greatest


Is -4 over 12 a rational number?

-4/12 equals -1/3, which has the pattern of 3's after the decimal point repeat infinitely. That is how -4/12 is a rational number.


Is the square root of an irrational number rational?

No: Let r be some irrational number; as such it cannot be represented as s/t where s and t are both non-zero integers. Assume the square root of this irrational number r was rational. Then it can be represented in the form of p/q where p and q are both non-zero integers, ie √r = p/q As p is an integer, p² = p×p is also an integer, let y = p² And as q is an integer, q² = q×q is also an integer, let x = q² The number is the square of its square root, thus: (√r)² = (p/q)² = p²/q² = y/x but (√r)² = r, thus r = y/x and is a rational number. But r was chosen to be an irrational number, which is a contradiction (r cannot be both rational and irrational at the same time, so it cannot exist). Thus the square root of an irrational number cannot be rational. However, the square root of a rational number can be irrational, eg for the rational number ½ its square root (√½) is not rational.