STD 8 MATHEMATICS LESSON. TERM 2 2020.
TOPIC –TIME
A day has 24 hrs
- Time can be given in
- 12 hour clock system.
- 24 hour clock system.
To convert a.m into 24 hr clock time
NB-the answer must be in 4 digits.
Eg a)3.20 am---------0320 hrs
-this means 3 hrs 20 min after midnight.
b)3 am-----------0300 hrs
-this means 3 hrs after midnight.
- C) 11.20 am------------1120 hrs
-this means 11 hrs 20 mins after midnight.
d)12.20 am ------------0020 hrs
-this means 20 mins after midnight.T
TO CONVERT PM INTO 24 HR CLOCK.
NB-add 12 hours e.g
a)3.45 pm
- 45
+ 12. 00
15.45 = 1545 hrs
1545 hrs means 15 hours and 45 minutes after midnight.
NB-Midnight is shown by 4 zeroes. i.e 0000 hrs.
To convert 24 hr clock time to am e.g
a)0705 h-------------7.05 am(omit the first zero)
b)1030 h- 10.30 am
c)1125 h---11.25 am
To convert 24 h clock time into pm
-The easiest way to recognize them (apart from 12) is to look for those Numbers from 13 to 23
E.g. 1730 h
-subtract 1200 hours.
1 7 3 0
_ 1 2 0 0
5 3 0
= 5.30 p.m
QUESTIONS
CONVERT THE FOLLOWING am/pm into 24 clock time.
- 4 am
