Inches. (i.e. 6" means six inches, whereas 6' means 6 feet)
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You represent a repeating number by putting a dash on top of the number. For example 56.1066666 you represent it by putting a dash on top of the 6
0 is nothing, you cannot divide a number by nothing, it would be the same as putting the number then the divide symbol and not putting another number in.
by either putting the negative number first, or by putting the negative number in parentheses. Like this: -9*1=-9 1*(-9)=-9
putting the top number on bottom and bottom number on top