200.
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The square root of 61.93 is irrational. Since rational numbers are infinitely dense there cannot be a closest rational.
200 is rational.Generally, a number is rational unless it involves roots, (like square root, cube root, ect.) or is a special number, like pi.An irrational number is a number that cannot be expressed as a fraction. This means that it has and infinite amount of digits that never repeat.
yes
Yes. It's the ratio of 605 to 1,000, or 121 to 200. Any number that you can write completely on paper using digits, and a decimal point or a fraction bar if you need them, is rational.
Yes.