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How can I subtract numbers quickly from 1000?
Updated: 11-Apr-2025

To subtract from 1000, subtract each digit from 9, except the last digit from 10. For 1000 − 648: 9−6 = 3, 9−4 = 5, 10−8 = 2 → answer: 352. This trick is helpful for making fast subtractions from 1000 without writing it down.

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