Subtraction of decimals involves the subtraction of the decimal number with a small whole number part from the decimal number with a greater whole number part.

Explanation: In this example,we can subtract 0.84 from 0.93, the digit 3 is smaller than 4 in the hundredths column, so we need to borrow 1 from 9 to do the subtraction. We need to decrease 1 from 9 since it has given 1 to the number to its left. So, 9 will become 8, and 3 will become 13. Now we subtract 13 - 4 = 9 and 8 - 8 = 0
Finally, we place a decimal point in the answer to get 0.09