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Measuring Time

Measuring Time. Time is measured in; Y_________ M_________ W_________ D_________ H_________ M_________ S_________. 12. A year has _____ months. A year has _____ weeks. A year has _____ days. A month has between ___ and ___ days. A week has _____ days. A day has _____ hours.

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Measuring Time

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  1. Measuring Time

  2. Time is measured in; • Y_________ • M_________ • W_________ • D_________ • H_________ • M_________ • S_________

  3. 12 • A year has _____ months. • A year has _____ weeks. • A year has _____ days. • A month has between ___ and ___ days. • A week has _____ days. • A day has _____ hours. • A hour has _____ minutes. • A minute has _____ seconds. 52 365 28 31 7 24 60 60

  4. How many seconds in 5 minutes? 60 x 5 = 300 • How many minutes in 10 hours? 60 x 10 = 600 • How many months in 200 years? 12 x 200 = 2400 • How many weeks in 2 years? 52 x 2 = 104 • How many days in 9 weeks? . 7 x 9 = 63

  5. How many seconds in an hour? 60 x 60 = 3600 • How many hours in a week? 24 x 7 = 168 • How many seconds in a year? 60 x 60 x 24 x 365 = 31536000

  6. Clocks • We usually use clocks and watches to measure time. • Clocks usually just display hours and minutes. Hours : Minutes 3 : 15 • But sometimes also display seconds Hours : Minutes : Seconds 3 : 15 : 23 • Sometimes clocks do not have the : separating the numbers.

  7. There are two main types of clocks; • 12 hour clocks. • 24 hour clocks. • A 12 hour clock counts from 1 to 12 in the morning then starts again in the afternoon. • Morning is labelled ____. • Afternoon is labelled ____. • A 24 hour clock simply counts from 0 to 23.

  8. Changing Times: 12  24 • When you want to change from a 12 hour time to a 24 hour time you sometimesadd 12. • If the time is after 1 pm ADD 12. • If it is a morning (__M) time do NOT ADD 12. • If it is a morning time that starts with 12 (right after midnight) then the 24 hour time starts with 0.

  9. Changing Times: 24  12 • When you want to change from a 24 hour time to a 12 hour time you sometimestake away 12. • If the 24 hour time is more than 12, take away 12. • If the 24 hour time is less than 12, DO NOT take away 12. • If the 24 hour time starts with a 0, the 12 hour time starts with a 12.

  10. Change these 12 hour times into 24 hour times. 12 Hour Time 24 Hour Time • 7:43 am _________ • 7:43 pm _________ • 2:28 pm _________ • 1:00 am _________ • 11:59 am _________ • 12:04 pm _________ • 3:40 pm _________ • 6:00 pm _________ • 9:14 am _________ • 12:34 am _________ 0743 1943 1428 0100 1159 1204 1540 1800 0914 0034

  11. Change these 24 hour times into 12 hour times. 24 Hour Time 12 Hour Time • 0932 ____:_____ __ __ • 1143 ____:_____ __ __ • 1313 ____:_____ __ __ • 1744 ____:_____ __ __ • 2357 ____:_____ __ __ • 0234 ____:_____ __ __ • 0012 ____:_____ __ __ • 1201 ____:_____ __ __ • 0059 ____:_____ __ __ • 2400 or 0000 ____:_____ __ __ 9 32 am 11 43 am 1 13 pm 5 44 pm 11 57 pm 2 34 am 12 12 am 12 01 pm 12 59 am 12 00 am

  12. How many hours and minutes between…. • 9.15am and 11.32am? • 4:12 am and 1634? • 11.00am Friday and 2.30pm Sunday? 2 hours and 17 minutes 12 hours and 22 minutes 51 hours and 30 minutes

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