7, 207
7 = thousands place
2 = hundreds place
0 = tens place
7 = ones place
You want to round to the nearest thousand, the 7 all the way on the left is the number you're looking for.
Next, the number to the right of it, is it higher than 5 or lower than 5?
Since the number on the right is lower than 5 (it's a 2 - in the hundred's place), you round down to 0. If it was higher than 5, you round the 7 in the thousands place to an 8.
7.207 rounded to the nearest thousand is 7,000