what is the divisblity rule of 7
Answers
Answered by
3
Answer:
cross off last digit, double it and subtract. Repeat if you want. If new number is divisible by 7, the original number is divisible by 7.
Answered by
2
Answer:
Subtracting 2 times the last digit from the rest gives a multiple of 7. (Works because 21 is divisible by 7.)
Similar questions