Page 157 - Maths Skill - 3

Time and Calendar 155

MIND MAP

Time and Calendar

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 11 12 1 ∴
So, Minutes = Hours × 60
2. Minute hand 9 10 2 3
3. Second hand 8 7 6 5 4 2. WEEK INTO DAYS
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 12 4. MONTHS INTO DAYS
is at 6 then we read it 10 11 1 2 ∴ 1 month = 30 days
as ‘Half Past’. 9 8 4 3 Days = Months × 30
7 6 5
Quarter Past

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

When the minute hand 11 12 1 1 year = 52 weeks
is after 6 then we read 10 2 1 week = 7 days
it as ‘Quarter to’. 9 8 4 3 1 month = 30/31 days
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