Table: Business permits issued by a municipal office — January 120, February 150, March 180, April 150. How many permits were issued in all four months?
Correct answer: A. 600
Add the four months: 120 + 150 + 180 + 150 = 600. Adding in pairs (120 + 180 = 300 and 150 + 150 = 300) makes the sum quick without a calculator.
easy