Class 8 Maths – Chapter 16: Playing with Numbers
Step 6: Finding Factors using Divisibility Rules
Divisibility rules help us find factors of large numbers easily.
🔹 Method
- Apply divisibility rules
- Identify possible divisors
- Confirm factors
📘 Solved Examples
Example 1: Find factors of 180
- Divisible by 2 → Yes
- Divisible by 3 → 1+8+0=9 ✔
- Divisible by 5 → Last digit 0 ✔
So, factors include 2, 3, 5, 6, 9, 10, etc.
Example 2: Is 420 divisible by 6?
- Divisible by 2 → Yes
- Digit sum = 6 → Yes
- Therefore divisible by 6 ✔
📝 Exam Writing Format
- Apply rule step-by-step
- Show calculation clearly
- Write final conclusion
🧠 Tip: If a number is divisible by 2, 3, and 5 → many factors guaranteed!
📘 Class 8 Mathematics – Complete Library
CBSE | NCERT | State Syllabus
Chapter 1: Rational Numbers
Chapter 2: Linear Equations in One Variable
Chapter 3: Understanding Quadrilaterals
Chapter 4: Practical Geometry
Chapter 5: Data Handling
Chapter 6: Squares and Square Roots
Chapter 7: Cubes and Cube Roots
- NCERT Notes
- MCQs
- Worksheet
- Worksheet Answers
- Mind Map & Easy Tricks
- Important Exam Questions
- Very Important Questions
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