Page 135 - Math Skill - 4

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MIND MAP

Time

Clock Conversion

“It is a tool to measure time”. 1. HOURS INTO MINUTES
Basically, there are 3-hands in a clock  1 hour = 60 minutes
1. Hour hand So, Minutes = Hours × 60
2. Minute hand 2. MINUTES INTO SECONDS

3. Second hand  1 minute = 60 seconds
So, Seconds = Minutes × 60
Reading Concepts
3. MINUTES INTO HOURS

Quarter Past and Quarter to Hours = Minutes
60
1. When the minute hand is before
6 then we read it as ‘quarter past’ 4. SECONDS INTO MINUTES
2. When the minute hand is after 6 Minutes = Seconds
the we read it as ‘quarter to’ 60
5. DAYS INTO HOURS
 1 day = 24 hours

Hours = Day × 24
Concept of a.m. and p.m.

� a.m. 12 midnight to 12 noon 6. HOURS INTO DAYS
� p.m. 12 noon to 12 midnight Hours
Days =
24

Calender Leap Year
1 year = 12 months “If the last two digits of a year is divisible by 4

1 month = 30/31 days then that year will be leap year”.
1 week = 7 days i.e., 2008, 2012, 2016, 2020 ... etc.

1 year = 365 days 6 hours � 1 leap year = 366 days
� Number of days in February = 29 days
1 year = 52 weeks