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21 st
AM And PM Century #Subject Enrichment
Skills
As explained earlier, the hour hand goes around twice the dial of clock in one day.
So, it shows the same time twice in a day. The time between 12 midnight and 12 noon
is expressed by ‘a.m.’ (ante meridiem). The time between 12 noon and 12 midnight is
expressed by ‘p.m.’ (post meridiem). It is wrong to write 12:00 a.m. or 12:00 p.m. for
the time 12 o’clock midnight or noon.
a.m. p.m.
Soni eats breakfast at 8:00 a.m. Moni watches TV at 8:00 p.m.
eSTiMATing The TiMe
A second is a very short unit of A minute is equal to An hour is equal to
time. It takes about 1 second to 60 seconds. It takes 60 minutes. It takes a
turn on a light or to open the about 1 minute to little more than an hour
door of a refrigerator. brush your teeth. to play a hockey match.
21 st
Project Century #Subject Enrichment
Skills
Duration of time is measured using various types of clocks, such as a
digital clock, analog clock, sand clock, etc. Explore how to work a sand
clock and make your own sand clock in the presence of an adult using
suitable materials.
185
Time
