A number is divisible by 2: if its last digit is divisible by 2, that is, its last digit is 0; 2; 4; 6; 8. 3: if the sum of its digits is divisible by 3. 4: if the number formed by the last 2 digits is divisible by 4. 5: if the last digit is divisible by 5, ie the last digit is 0 or 5. 6: if the number is divisible by both 2 and 3. With 8: if the number formed by the last 3 digits is divisible by 8. 9: if the sum of the digits is divisible by 9. With 10: if the last digit is zero. 25: if the number formed by the last 2 digits is divisible by 25. Divide by 11 the number whose sum of digits in even local value is equal to the sum of the digits in odd local value, or the difference between the two is a multiple of 11. The number that can be divided by 4 and 3 can be divided by 12. With 13, we can examine the divisibility by adding 4 times the last digit to the number formed from the first digit to the penultimate digit of the number. The number that can be divided by 2 and 7 is also divisible by 14. The number that can be divided by 3 and 5 is also divisible by 15. The number whose four-digit number formed from the last four digits is also divisible by 16 is divisible by 16. With 17, we can examine the divisibility by subtracting five times the last digit from the number formed to the first digit of the number. The number that can be divided by 2 and 9 is divisible by 18. By 19, we can examine the divisibility by adding twice the last digit to the number formed from the first digit to the penultimate digit of the number. By 20 The numbers whose two-digit number formed from their last two digits can be divided by 20 can be divided. 21 Divides numbers that can be divided by 3 and 7. 22 Divide numbers that can be divisible by 2 and 11. By 23 we can examine the divisibility by adding 7 times the last digit to the number formed from the first digit to the penultimate digit of the number. If this number is divisible by 23 then the original is also. By 24 Divide the numbers that can be divided by 3 and 8. 25 Numbers whose last two digits are also divisible by 25 can be divisible by 25. By 26 Divide the numbers that can be divided by 2 and 13. 27 The number must be arranged in blocks from the back so that there are 3 digits in a block. The blocks (i.e., the formed three-digit numbers) are added. If this amount is divisible by 27, then the original number is also. With 28 Divide the numbers that can be divided by 4 and 7. By 29, we can examine the divisibility by adding three times the last digit to the number formed from the first digit to the penultimate digit of the number. If this number is divisible by 29, so is the original. With 30 Divide numbers that can be divided by 3 and 10. By 31 we can examine the divisibility by subtracting three times the last digit from the number formed by the first digit to the penultimate digit. If this number is divisible by 31, so is the original. By 32 Numbers whose last five digits are also divisible by 32 can be divisible by. 33 Numbers that can be divided by 3 and 11 are also divisible by. 34 Numbers are divisible by 2 and 17. 35 Divides numbers that can be divided by 5 and 7. With 36 Divide numbers that can be divided by 4 and 9. By 37, we can examine the divisibility by subtracting 11 times the last digit from the number formed to the first digit to the penultimate digit. If this number is divisible by 37, so is the original. With 38 Divide numbers that can be divided by 2 and 19. 39 Numbers can be divisible by 3 and 13. 40 Numbers whose last three digits are also divisible by 40 can be divisible by 40. With 100: if the last 2 digits are zero.