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Yes, on its own, the 7 has the digital value of the unit column.(The British unit column is called the ones column in America, I believe.)
The UNIT's column.
It depends.
a unit vector is any vector with length or absolute value 1. A column vector is any vector written in a column of since we say an mxn matrix is m rows and n columns, a column vector is mx1 matrix.
Whether to round up or down depends on the digit in the units column. If the unit value is less than 5, you round down, if the unit value is 5 or above, round up. For example: 12 (The unit column contains a 2, which is less than 5, so round down) becomes 10 15 (The unit column contains a 5, which is 5 or above, so round up) becomes 20