Question:

Derek purchased concert tickets in the month of June for $73, $66, $96, $17, and $66 dollars. Which of the following is an accurate estimate of the total amount he spent on concert tickets in June?

A $330

Explaination

The easiest way to make an estimate is to round each number so there is only one nonzero digit. Then you can easily add up the numbers:
$2069_w60_h13.png$
$8436_w60_h13.png$
$8593_w69_h13.png$
$5694_w59_h14.png$
$8436_w60_h13.png$
70+70+100+20+70=330