What did you have last time that was incorrect? Maybe they want 77 hundreds?
I am thinking that may be correct. Same here LOL, of course my kid just happen to leave the math book at school. I am going off the instructions from the worksheet. We had this same assignment about 3 weeks ago. My kid did the assignment in class, of course all were wrong and was told to correct the assignment at home.
question: was that table given to your kid? or did he have to come up with his own table?
if he has to come up with his own table, i'd add a thousands column. the result would look like this:
Number.......Thousands...........Hundreds.........Tens..........Ones
.7700...............7......................7..................0...............0
..500................0......................5..................0...............0
.3100...............3.......................1.................0...............0
of course, the problem here is: there's no challenge! all we are doing here is rewriting the numbers themselves with each digit in corresponding columns
EDIT: ok, since the thousands column is not listed, go with my first answer