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If the number has a + sign then you add it, if it has a - sign, then you subtract it.

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If the number has a + sign then you add it, if it has a - sign, then you subtract it.

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The scientific name for the number sign "#" is octothorpe.

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The cent sign is put after the number, as opposed to the dollar sign, which is put before the number.

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Octalthorp. Note that, in Britain the '#' sign is called 'hash' and isn't used as the number sign - we write 'No.' for number.

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Think of it like this:

  • The product of a negative number times a number (call it B), will be the opposite sign of the sign of number B.
  • The product of a positive number times a number B, will have the same sign as the sign of number B.
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