| A | B |
|---|
| 2 | all even numbers |
| 3 | the sum of the digit's numbers is a multiple of 3 |
| 4 | the last two digits are both zeros, or they form a 2-digit number evenly divisible by 4 |
| 5 | the number ends in either a 5 or a 0 |
| 6 | the number is evenly divisible by 2 and by 3 (use the rules for both) |
| 7 | subtracting two times the units (ones) digit from the remaining digits results in a multiple of 7 |
| 8 | the last three digits are all zeros, or they form a 3-digit number evenly divisible by 8 |
| 9 | the sum of the number's digits is evenly divisible by 9 |
| 10 | the number ends in zero |
| 11 | all the digits in the number are the same, or the number has only 3 digits and the sum of the "outside" digits is the same as the value of the middle digit, or the difference between their sum and the middle digit is 11 |
| 12 | the number is evenly divisible by 3 and by 4 (use the rules for both) |
| 13 | subtracting nine times the units (ones) digit from the remaining digits results in a multiple of 13 |
| 15 | the number is evenly divisible by 3 and by 5 (use the rules for both) |
| 20 | the units digit is 0 and the tens digit is even |
| 22 | the number is even and it is evenly divisible by 11 |
| 24 | the number is evenly divisible by 3 and by 8 (use the rules for both) |
| 25 | the last 2 digits are 00, 25, 50, or 75 |
| 30 | the number ends in 0 and is evenly divisible by 3 |
| 33 | the number is evenly divisible by 3 and by 11 (use the rules for both) |
| 36 | the number is evenly divisible by 4 and by 9 (use the rules for both) |
