BajrangAssociate
VedaMind
Back to Mental Maths

Unit Digit of Powers Exam favourite

Unit digits repeat every 4 powers

The Rule

  1. 1Only the unit digit of the base matters.
  2. 2Unit digits of powers repeat in a cycle of 4 (e.g. 7 → 7, 9, 3, 1).
  3. 3Divide the exponent by 4: remainder r means the r-th term; remainder 0 means the 4th term.