Is it wrong to write 5885 without a comma? In my test, I put it like that, and I know the answer is correct, but the online test told me I was wrong. My friends say that they put in 5,885 with the comma, so maybe that's why I was wrong. However, my teacher never mentioned that it was required to put in a comma, and my answer is correct. Was it wrong of me not to write a comma? Am I the one at fault?