Here are some hints you may need:

1) If you use `/`

on arguments which will be integers then your result will also be integer.

Example:

```
int x = 7/2;
System.out.println(x);
```

output: `3`

(not `3.5`

)

So to get rid of last digit of integer all you can do is divide this number by 10 like

```
int x = 123;
x = x/10;
System.out.println(x);
```

Output: `12`

2) Java also have modulo operator which returns reminder from division, like `7/2=3`

and `1`

will be reminder. This operator is `%`

Example

```
int x = 7;
x = x % 5;
System.out.println(x);
```

Output: `2`

because `7/5=1 (2 remains)`

So to get last digit from integer you can simply use `% 10`

like

```
int x = 123;
int lastDigit = x%10;
System.out.println(lastDigit);
```

Output: `3`

Now try to combine this knowledge. Get last digit of number, add it to sum, remove this last digit (repeat until will have no more digits).