805 has three significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
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3, one of the rules is counting the Zero between none zero numbers
80
100.625
8,050
3220 divided by 4 is 805, with no remainder. Division is the mathematical operation of splitting a number into equal parts. In this case, 3220 is divided into 4 equal parts, resulting in each part being 805.