Volume of cylinder: pi*12 squared *7 = 3166.725 cubic units rounded to 3 decimal places
Three. All non-zero digits are significant, all zeroes between other digits, and all digits to the right of the decimal. The reason for this is that if this is rounded off, it apparently is rounded off to the nearest tenth, otherwise the tenth place would not be shown. if it were rounded off to the unit, it would read 39, not 39.0 ■
As shown, a terminating decimal.
This function has to do with the format of a cell and how many decimal places are shown. Applies only to numbers. Keep in mind that the actuall value is unchanged. For example, the number will be rounded if you specify 0 decimal places.
It is already shown as a decimal as 31.5
It mean to add more decimal places to a value. Sometimes this will show a more accurate value, rather than a rounded up value which is being shown because there are not enough decimal places to show the value in full.
It is: 1/20 = 0.05 as a decimal
A repeating decimal is usually shown with a bar over the decimal that is repeated
It is 0.6666 (6 repeated infinitely, usually shown as 0.66, with a bar notation above the 6). Typically this is rounded to either 0.67 or 0.667.
It is usually a fraction, as it is usually shown in a ratio. Decimal and percentages can be used though.