204 thousands equals to 204, 000 as the mathematical value and expression.
In expanded form
200, 000 + 4, 000 = 204, 000
In word form,
Two hundred and four thousand
Ok so you round 31 to 30 and 43 to 40 and then you multiply 30 by 40 and get 1200. 1200 is the same thing as 1200.00 bc you can take off the zeros after the decimal and it will be the same. Hope this helped and if your still confused you let me know I'll try to explain it more.