The decimal point is positioned between the digits whose place value is units (10^0) and tenths (10^-1). To the left of the decimal point, the digits may be grouped in threes by using commas or spaces eg 12 345 678.923 or 12,345,678.923
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keep your decimals in the right position
plus sign (+), minus (-), number (#), decimal point for decimals and money, percent (%), dollar sign ($), equal (=)
Move the decimal place one position to the right and you will have an equivalent number in tenths of a unit.
None. A decimal is a way of representing numbers in such a way that the place value of each position in the number is ten times that of the position to its right.
Treat them exactly like you would adding up whole numbers but align all the columns so that the decimals points are all in line/column and carry this point (and its position) down into the answer. 077.2 033.05 110.91 -------- 221.16