Time and Calendar
ICSE · Class 4 · Mathematics
All formulas from Time and Calendar in ICSE Class 4 Mathematics. Key equations, constants, and identities for board exam preparation.
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Formulas
Time Measurement
60 seconds = 1 minute
60 minutes = 1 hour
24 hours = 1 day
Calendar and Dates
7 days = 1 week
12 months = 1 year
365 days = 1 year, 366 days = 1 leap year
Time Conversions
Total seconds = (minutes × 60) + seconds
Total minutes = (hours × 60) + minutes
Hours = Total minutes ÷ 60
Days = Total hours ÷ 24
Operations on Time
Add seconds first → carry over minutes if ≥60
Subtract seconds first → borrow 60 if needed
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