Looking for a fun way for your students to get more practice calculating elapsed time? Students will read 12 clock faces and determine the time to the nearest 5 minutes. They are then asked the question What time did the event start? What time was it 2 hours and 20 minutes ago? Or, What time will it be in 1 and 1/2 hours? Then they will match their correct times to answer a riddle at the bottom of each worksheet.Use as a fun, math center, homework assignment, independent practice, or allow st