The top number is called the [[numerator]]. The bottom number is the [[denominator]].
The top number is called the [[numerator]]. The bottom number is the [[denominator]].
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All fractions can be expressed as [[decimal]]s, and vice versa. If the denominator is not a [[power of ten]], you get a [[repeating decimal]] or [[repeating fraction]]. You can round it off, or use a vertical line over the repeating digits.
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1/3 = 0.33 (rounded to two digts)
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The digit 3 repeats indefinitely, so if you need more precision you can write 0.33333 or whatever.