Question

divisibility rule for 7​

Answer 1

Answer:

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.

Answer 2

Answer:

take a number let it be 343 I am explaining using this number

step 1 separate the last digit

the number becomes 34 and the last digit is 3

step 2 now double the last digit which makes it 6

step 3 now subtract it from the number obtained after removing the last digit

34-6=28

if the difference is divisible by seven then the number is divisible by seven

28/7=4 so 343 is divisible by 7

you can repeat step 1 to 3 till the number becomes 2 digit or single digit

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