What is the divisible rule for 7?

Answer 1

To discover whether a number is divisible by 7, double the last digit of the number, and subtract it from the rest of the number. If the result is either 0 or divisible by 7, then the number is divisible by 7. For example:

672 - last digit is 2, double 2 to make 4, subtract from 67 equals 63, 63/7 = 9, therefore, 672 is divisible by 7.

Dividing by 7 (2 Tests)

• Take the last digit in a number.
• Double and subtract the last digit in your number from the rest of the digits.
• Repeat the process for larger numbers.
• Example: 357 (Double the 7 to get 14. Subtract 14 from 35 to get 21 which is divisible by 7 and we can now say that 357 is divisible by 7.

  NEXT TEST

• Take the number and multiply each digit beginning on the right hand side (ones) by 1, 3, 2, 6, 4, 5. Repeat this sequence as necessary
• Add the products.
• If the sum is divisible by 7 - so is your number.
• Example: Is 2016 divisible by 7?
• 6(1) + 1(3) + 0(2) + 2(6) = 21
• 21 is divisible by 7 and we can now say that 2016 is also divisible by 7.

Answer 2

take twice the last digit from the rest

so if i had 357, 7 is the last digit, so 7*2 = 14. so weve taken the last digit and doubled it (357), the rest is 35 (357). now we have to take 14 from 35, which is 21. now, 21 is in the 7 times table, so 357 is in the 7 times table. so many people think there isn't a rule for it, but there is!