Page 185 - Revised Maths Wisdom Class - 3

Time and Calendar 183

COGNITIVE

MAP

Time and Calendar

© G. Ram Books (P.) Ltd.©

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 12 ∴
2. Minute hand 10 11 1 2 So, Minutes = Hours × 60
3. Second hand 9 8 4 3 2. WEEK INTO DAYS
7 6 5 ∴ 1 week = 7 days

Days = Weeks × 7
Reading Concepts 3. DAYS INTO HOURS

1 day = 24 hours
∴
Half Past Hours = Day × 24
When the minute hand 11 12 1 4. MONTHS INTO DAYS
is at 6 then we read it 9 10 2 3 ∴ 1 month = 30 days
as ‘Half Past’. 8 7 6 5 4 Days = Months × 30

Quarter Past

When the minute hand 11 12 1
10 2 Calendar
is before 6 then we read 9 3
8 4 1 year = 12 months
it as ‘Quarter Past’. 7 6 5 1 year = 365 days 6 hours
Quarter to 1 year = 52 weeks

When the minute hand 10 11 12 1 2 1 week = 7 days
is aft er 6 then we read it 9 3
8 4 1 month = 30/31 days
as ‘Quarter to’. 7 6 5
1 leap year = 366 days

1 decade = 10 years
Concept of a.m. and p.m. 1 century = 100 years

 a.m. 12 midnight to 12 noon  If any year is divisible by 4
 p.m. 12 noon to 12 midnight then it will be a leap year.