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From Vikidia, the encyclopedia for 8 to 13-year-old children that everybody can make better
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0 is a number. 0 means nothing. 0 is an oval. It can get confused with the letter O. 0 is used in decimals like this one: 0.2. It means 2 tenths (2/10) or 1 fifth (1/5) not negative 2 (-2).