Characteristics of numbers divisible by 8, 125, 7, 11, 13 The number that can be divided by 8, 125, 11, 13 is more detailed!

Characteristics of numbers divisible by 8, 125, 7, 11, 13 The number that can be divided by 8, 125, 11, 13 is more detailed!

8: Look at the last three digits. The last three digits can be divided by 8
125: if the last three digits are multiples of 125, then this number is a multiple of 125
11: Add a number from the right to the left, and then calculate the difference between the odd and even digits. If the difference is a multiple of 11 (including 0), then the original number must be divisible by 11
For example, judge whether 491678 can be divided by 11
- → sum of odd digits 9 + 6 + 8 = 23
- → sum of even digits 4 + 1 + 7 = 12 23-12 = 11
Therefore, 491678 can be divided by 11
This method is called odd even difference method
In addition to the above methods, we can also use the cut subtraction method to judge. That is: subtract 10 times, 20 times, 30 times of 11 from a number If the remainder can be divided by 11, then the original number must be divided by 11
13: If the number of one digit of an integer is truncated, and then four times of the number of one digit is added to the remaining number, if the difference is a multiple of 13, then the original number can be divided by 13. If the difference is too large or it is difficult to see whether it is a multiple of 13 by mental arithmetic, we need to continue the above process of "truncation, multiplication, addition and difference checking" until we can make a clear judgment