Peter has 900 New Zealand dollars. If 1 U.S. dollar equals 1.4167 New Zealand dollars, about how many U.S. dollars can Peter buy for his New Zealand dollars?

Multiply the NZ dollar amount by the conversion factor:

900 NZ dollars              1 US dollar
--------------------- * -------------------------- =  $635.28, or approx. $635. 
             1               1.4167 NZ dollars