Is the following statement correct? Tell me why.

1 is wrong; like 13

2 is right; odd numbers can be expressed as 2n 1 divided by 2 will definitely leave 1

3 pairs; like more than two digits Any number can be expressed as a times 10 plus b times 100, etc.

After dividing by 2, they are all integers, but after dividing the units digit by 2, there will definitely be 1 left

4 Wrong; 1 3 3 = 7, 7 cannot be divided by 3

5 Correct; 2 2 5 = 9, 9 can be divided by 3, because the ones digit is 5, so it must be divided by 5 Divisibility

To determine whether it is divisible by 3, it is to add the numbers in each digit. If the sum can be divided by 3, then the original number can be divided by 3

To determine whether it is divisible by 5, as long as the ones digit is 5 or 0, it will be enough, but a direct 0 cannot be divisible by 5