326 and we're going to divide that by 4. so what I mean is I'd like you to try to divide 4 into 3 first but since 4 times 1 is 4 and 4 that's already too big then I can't divide into three so then I ...

The number 1 has one digit and is divisible by 1; 12 has two digits and is divisible by 2; 123 has three digits and is divisible by 3. Which new digit (not already used) can be added to the end of 123 ...