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What is the purpose for leaving decimal values at the end of a number? The may give additional precision or may be indicators of the number of significant digits in the calculation. As an example of the latter, 5.000 kilometres is, at first sig â¦ ht, no different from 5 km.
To subtract decimal numbers: 1  Put the numbers in a vertical column, aligning the decimal points. 2  Subtract each column, starting on the right and working left. 3  Place the decimal point in the answer directly below the decimal points in the terms. 4  Check your answer by adding the result to the number subtracted.