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Second Fix: The "Century" Rule
Last updated at January 28, 2026 by Teachoo
Class 7 (Ganita Prakash 1, 2 & old NCERT)
Chapter 4 Class 7 - Another Peek beyond the Point (Ganita Prakash II)
- Quick Recap
- Decimal Multiplication
- Is the Product Always Greater than the Numbers Multiplied?
- Figure it out - Page 73
- Decimal Division
- Division using Long Division
- Figure it out - Page 83
- Division with a Decimal Divisor
- Special Cases of Division
- Dividend, Divisor, and Quotient
- Figure it out - Page 86, 87
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Look Before You Leap!
- Figure it out - Page 93, 94, 95
Transcript
Second Fix: The "Century" RuleBecause we added a little too much time with the 4-year rule, the calendar started getting ahead of the Sun again. We need to take some days back To fix this, they made a new rule: If a year is divisible by 100, it is NOT a leap year. So, the year 1900 was divisible by 4, but because it was a century year (divisible by 100), it stayed at 365 days. This removed some of that "extra" time we had over-added. But: There was one more problem If we skip every 100 years, then in 400 years we skip 4 leap years But we were ahead by 3.12 days every 400 years So, we need to add another year – which is our Final Fix
