These are decimal numbers, and dots above some of the digits make them recurring decimals. One dot means the digit under it repeats infinitely. In other words, it goes on forever (and ever and ever).
\(\frac{3}{10}\) means three tenths, and is written as \(0.3\). \(\frac{17}{100}\) means seventeen hundredths, and is written as \(0.17\). Similarly, \(0.2\) becomes ...
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