round off 863 to one significant figure?

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so sig figs are non zero figs and also not in front of decimal so 800=1 sig fig, 8 but 800.0 has 3: 8, 0,0 because there is a decimal and to the left of decimal, all is counted  so 863 had no decimal so I would round the top number (8) look at number to right (6) is more than 5 so round up 900 with out decimal is answer

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