What is the divisibility rule for 91?

Answer 1

Oh honey, buckle up. The divisibility rule for 91 is a doozy. Basically, if a number is divisible by 91, it's also divisible by 13 and 7. So, you better grab a calculator and start crunching those numbers if you want to see if 91 can divide into your digits. Good luck, you're gonna need it!

Answer 2

Oh, dude, you're hitting me with the big math questions! So, like, the divisibility rule for 91 is that if you divide a number by 91 and you get a whole number without any remainder, then it's divisible by 91. But seriously, who's out there dividing by 91 all the time? Just use a calculator, man!

Answer 3

Well, isn't that a happy little question! To check if a number is divisible by 91, you can add 9 times the last digit to the number formed by the rest of the digits, then repeat the process until you get a number you know is divisible by 91. It's like painting a beautiful landscape, just take it one step at a time and enjoy the process!

Answer 4

To determine if a number is divisible by 91, you can use the divisibility rule for 13 and 7. For 13, you can add four times the units digit to the number formed by the remaining digits. If the result is divisible by 13, then the original number is divisible by 13. For 7, you can double the units digit and subtract the result from the number formed by the remaining digits. If the result is divisible by 7, then the original number is divisible by 7. If the number passes both tests for 13 and 7, then it is divisible by 91.

Answer 5

The number must meet two criteria:

• Take the original number excluding its last digit and subtract two times the last digit from it. The result must be divisible by 7.
• Take the original number excluding its last digit and subtract nine times the last digit from it. The result must be divisible by 13.

In both cases, you can repeat the "truncate-and-subtract multiple" stage several times, if required.