Measures of time A.M. and P.M. * The time between 12 o'clock midnight and 12 o'clock noon is called a.m . ( ante meridian ) * The time between 12 o'clock noon and 12 o'clock midnight is called p.m. ( post meridian ) Example : 10 o'clock in the morning is written as 10 a.m. and 10 o'clock in the night is written as 10 p.m. 1 day = 24 hours. 1 hour = 60 minutes. 1 minute = 60 seconds Example: 1. How many hours are there in 9 days? Solution : 1 day = 24 hours. = 9 days x 24 hours = 216 hours; Answer Example: 2. Convert: 18 days 11 hours into hours Solution : 1 day = 24 hours. = 18 x 24 hours + 11hours = 432 hours + 11hours = 443 hours; Answer Example: 3. Convert: 2 days 2 h...