Arithmetic and pre-algebra Fractions Number sets Number Sets Number Sets 1 Number Sets 2 Number Sets 3 Number Sets 1 Number Sets 1 Back Number Sets 1 ⇐ Use this menu to view and help create subtitles for this video in many different languages. You'll probably want to hide YouTube's captions if using these subtitles. we are asked 'what number set does the number 8 belong to?' so this is actually a good review of the different sets of numbers we often talk about so the first set under consideration is the natural numbers natural numbers and these are essencially the counting numbers and you're not and not counting 0, 1, 2, 3, so on and so forth so clearly 8 is a natural number, you can count up to 8 here, you can count 8 objects so 8 is a member of the natural numbers so it is a natural number, we should say the next one we should consider, let's consider the whole numbers whole numbers, right over here and i should say natural numbers so let's consider the whole numbers the whole numbers are essencially the same thing as the natural numbers, but we're now going to include the 0 so it's 0, 1, 2, 3, so on and so forth so clearky 8 is one of these as well you could eventually increment your way to 8 like here just counting all of the whole numbers another way to view this is the non-negative numbers so 8 clearly belongs to this as well so let's expand our set a little bit, let's think about integers let's think about the set of integers now these are all the numbers starting with well, you could keep counting down, but all the way up to -3, -2, -1, 0, 1, 2, 3 and you could just keep going there now clearly 8 is one of these as well, you can just keep counting to 8, in fact, you can let me just put a check box there and in general, you have the integers that contain both the positive and the negative numbers Questions Tips & Feedback Be specific, and indicate a time in the video: At 5:31, how is the moon large enough to block the sun? Isn't the sun way larger? Have something that's not a question about this content? Post a tip or feedback General discussion about the site Report a technical problem with the site Request a video or feature This discussion area is not meant for answering homework questions. Formatting tips Cancel or ( total) Share a tip When naming a variable, it is okay to use most letters, but some are reserved, like 'e', which represents the value 2.7831... Suggest a fix At 2:33, Sal says "double bonds" but should say "single bonds." Have something that's not a tip or feedback about this content? Ask a question General discussion about the site Report a technical problem with the site Request a video or feature This discussion area is not meant for answering homework questions. Formatting tips Cancel or Discuss the site For general discussions about Khan Academy, visit our Reddit discussion page. Flag inappropriate posts Here are posts to avoid making. If you do encounter them, flag them for attention from our Guardians. abuse disrespectful or offensive an advertisement not helpful low quality not about the video topic soliciting votes or seeking badges a homework question a duplicate answer repeatedly making the same post wrong category a tip or feedback in Questions a question in Tips & Feedback an answer that should be its own question about the site a question about Khan Academy (Visit our FAQ) a post about badges a technical problem with the site (Report a problem) a request for videos or features
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