Nothing. I know all that I need to know.
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You add it. Or you can use decimals if i have $8.50 and i want to take out $5.00 i would use decimals and same if your adding subtracting etc. If you don't know how to multiply decimals just ignore them then add them i the end, how you know where it goes? You count how many numbers are behind! Same for division except you divide.
your dumb if you don't know how to round decimals on a number line
I dont know
That depends how you want to round it - mainly, how many decimals you want to keep.
I don't know ok