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
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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.