Generating random simple math division problems

I'm making a simple Android app for my daughter so she can do math problems. I found it fairly easy to generate addition, subtraction and multiplication questions at random, however division is more tricky.

I don't want to get into decimals, so I have to check each is divisible without remainder. This is what I am working with...

public void genDivQuestion() {
        text = (TextView) findViewById(R.id.textView1);
        text.setText(divisible());
        answer = first / second;
}

public String divisible() {
        first = RandomNumGen.getRandIntBetween(2, 12);
        second = RandomNumGen.getRandIntBetween(2, 12);
        if (first % second == 0) {
            return first + " \u00F7 " + second + " = ?";
        } else {
            return "0";
        }
}

I'm not sure what to do at the line "return "0";". If I try calling divisible() to try again, the app just crashes.