Page 28 - 新思维数学学生用书4 样章
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2.1 Time
2.1 Time
We are going to ...
• read and tell the time on digital and analogue clocks
• use a.m., p.m., and 12-hour and 24-hour clock notation with digital
and analogue clocks.
Where have you seen clocks like these?
a.m.
11 12 1 analogue clock
10 22 23 00 13 14 2 digital clock
9 21 15 3 hour
8 20 19 18 17 16 4
7 6 5 minute
p.m.
An analogue clock has two scales – A digital clock shows second
one from midnight to midday and a time of 13:26
the other from midday to midnight. which is 1.26 p.m.
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Worked example 1 10 12 1 2
The clock shows a time in the evening. 9 3
a Show the same time on a 24-hour digital clock. 8 7 5 4
b Write different ways the time could be recorded. 6
Answer: When recording time using the 24-hour
a The clock shows 6:50 in the clock you will always use four digits.
evening. To change an evening time to 24-hour
In 24-hour digital time this is 18:50. time you have to add 12 to the hours.
b 6.50 p.m. 6 + 12 = 18
Ten to seven in the evening. You use ‘p.m.’ to show that the time
Ten minutes to seven in the is in the evening.
evening.
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