Topic 1
Sample content
Reading large numbers
Think about it
India's population is about 1,40,00,00,000. A news site writes it as 1.4 billion. Are they the same number? How would you read it aloud?
The idea
Large numbers are easier to read when we group digits. In the Indian system we group from the right as 3 digits, then 2, 2, 2: ones, thousands, lakhs, crores. Commas mark each group, and each group has a name you say aloud.
Place value names
| Number | Read as |
|---|---|
| 1,000 | One thousand |
| 1,00,000 | One lakh |
| 1,00,00,000 | One crore |
| 2,45,630 | Two lakh forty-five thousand six hundred thirty |
Worked example
- 1Number: 37582104
- 2Group from the right: 3,75,82,104
- 3Read: three crore seventy-five lakh eighty-two thousand one hundred four
Activity · Try it at home
Find three big numbers around you: the price of a bike, a car's odometer, or your city's population. Write each with Indian commas and read it aloud to a family member.
Key takeaways
- Group digits from the right: 3, then 2s
- 1 lakh = 1,00,000 and 1 crore = 1,00,00,000
- Commas make large numbers easy to read
- Read each group with its place name