If a number is divisible by two co-prime numbers,

it is divisible their product

 

Example

80 is divisible by 4 & 5

Since 4 & 5 are co-prime,

80 will be divisible by 4 × 5 = 20 also

Rough

Factors of 4 are 1, 2, 4

Factors of 5 are 1, 5

Since common factor is 1

∴ 4 & 5 are co-prime

 

  1. Chapter 3 Class 6 Playing with Numbers
  2. Concept wise
Ask Download

About the Author

CA Maninder Singh's photo - Expert in Practical Accounts, Taxation and Efiling
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 8 years. He provides courses for Practical Accounts, Taxation and Efiling at teachoo.com .