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Concept of Unit Digit
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This lesson is on understanding the concept of unit digit and solving questions based on that.

Vishal Sharma
I am an engineer by education and teacher by choice.I have been training students for CAT exams for 16 years.I have worked with top brands l

Unacademy user
Sweta Kumari
a month ago
thanks
  1. Faculty : Vishal Sharma More than 16 years of experience in CAT training Trained 10000+ students till date


  2. Concept of Unit Digit Q.) What is the Unit Digit of 125A125 Well Most of You Will be Troubled! Need Not Worry...Why?


  3. Let's learn the Concept Basics: So the Idea is to focus on 12 13 ..5 UNIT DIGIT 12 * 13 -..6 22* 23- ....6


  4. Let's understand the question So 125A125 Unit digit? It's nothing but 5A125 We need to learn: UNIT DIGIT Now Let's Find what is that? POWER CYCLE


  5. Power Cycle .2 2A1-2 Unit digit starts repeating after 4 powers.So 2 2/4/8/6 2A2-4 2A3-8 2A4-6 2A5-32 4-4/6/4/6 5- 5/5/5/5 6-6/6/6/6 7-7/9/3/1 8-8/4/2/6 9-9/1/9/1 . So on


  6. So In our Question 5 Q) 137A135 Q) 146A 400


  7. Thank You