Question

find without doing actual division whether 640650 is divisible by 15 (Hint:15=3×5.Use the property of co-primes and solve the problem.) step by step explain​

Answer 1

Answer:

Infact considering a hint easier than u have given , we can solve swiftly

That number should be divisible by 15 add both digits u get 1+5=6 ,which is divisible by 3 ,

Now just add the digits of the above number 640650 u will get 6+4+0+6+5+0=21 , Again add those digits 2+1= 3 . Hence by property of divisibility of 3 . we can say it is divisible just by adding digits and analysing whether it's divisible by 3 or not!!

Step-by-step explanation:

Hope that helps!!