Question

Divisibility rule of 7 and 11 in short form​

Answer 1

Answer:

Rule: Take the last digit and cross it out from the original number. Then double it. Subtract it from the “new” number which is the original number excluding the last digit. If the difference is divisible by 7, then the original number must also be divisible by 7.

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Answer 2

Answer:

"Divisibility by 7 and 11.

7 is Divisible by taking the last digit of the number, doubling it and then subtracting the doubled number from the remaining number. If the number is evenly divisible by seven, the number is divisible by seven!

Divisibility Test for 11: For a 3-digit number, sum of the outside digits minus the middle digit must be 0 or 11."