Question by Lionel Messi - Discuss with MathYouLike

Lionel Messi

19/03/2017 at 11:41

What is the ones digit of 7²⁵?

Operation of Indices

List of answers

FA KAKALOTS 06/02/2018 at 12:30

We have : 725 = (74)6.7

The units digit of 74 is 1 (74 = 2401),so the units digit of (74)6 is 1

=> The units digit of 725 is 7
Phan Thanh Tinh Coordinator 23/03/2017 at 17:47

We have : 7²⁵ = (7⁴)⁶.7

The units digit of 7⁴ is 1 (7⁴ = 2401),so the units digit of (7⁴)⁶ is 1

=> The units digit of 7²⁵ is 7

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