Question

divisibility rule for 7​

Answer 1

Step-by-step explanation:

To determine if a number is divisible by 7, take the last digit off the number, double it and subtract the doubled number from the remaining number. If the result is evenly divisible by 7 (e.g. 14, 7, 0, -7, etc.), then the number is divisible by seven. This may need to be repeated several times.

Example: Is 3101 evenly divisible by 7?

310 - take off the last digit of the number which was 1

-2 - double the removed digit and subtract it

308 - repeat the process by taking off the 8

-16 - and doubling it to get 16 which is subtracted

14 - the result is 14 which is a multiple of 7

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Answer 2

Answer:

• Take any number say 1234
• take twice the last digit(in this case 2*4=8)
• subtract the value you got by the remaining 3 digits

      123

       - 8

• check whether the answer is divisible by 7

The above is the divisibility rule for 7