To subtract a three-digit number from 1,000 every number has to be subtracted from 9 except for the last number, which has to be subtracted from 10.
For example: Let’s take 1,000 - 765 Subtract 7 from 9 = 2 Subtract 6 from 9 = 3 Subtract 5 from 10 = 5 The answer obtained is 235 So 1,000 - 765 = 235
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