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Divisible by 7 (Math Trick)...

A number is divisible by 7 if, subtract 2 times the last digit from the remaining number and its result is divisible by 7.

Let us we will apply this interesting math rule on following examples.


  • Is 203 divisible by 7?
  • Here the last number is 3 and remaining is 20. Apply the above rule. i.e. Double the last digit (3) and subtract it from remaining number (20)

    Now the result 14 is divisible by 7 so 203 is divisible by 7.
    (Do this step in your mind)


  • Is 3164 divisible by 7?
  • Here 308 is big number (If you feel difficult to divide you can apply the rule again).

    Now the result 14 is divisible by 7 so the number 3164 is also divisible by 7.
    (Do this step in your mind)


  • Is 108346 divisible by 7?
  • Now the result 91 is divisible by 7, so the number 108346 is also divisible by 7.
    (Do this step in your mind)


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