Squaring 1673, 983 and 843 in 5 Seconds II Superfast Trick to Find Squares

[@bas3995]

Good evening sir
I appreciate your good efforts for making it easier not only for students but also for all who prepare for competitive exams. Really nice tricks and simple to practice. Thank you sir

[@PHYSICSFOREVERDPN]

Sir.. 85 square to take first digital 8x8 but how 8x9 sir..