Class 6 · Chapter 3
Number Play
Counting, place value, comparisons, and mental strategies for large numbers.
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Ganita Prakash · Class 6 (2026-27)
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Tip: NCERT updated the syllabus for 2026-27. The links above open the latest edition on the official portal — chapter titles and numbering may differ from the notes shown here.
Detailed theory
Indian: ..., crore, lakh, thousand, hundred, ten, one — commas after 3, 5, 7 digits from right. International: ..., billion, million, thousand, hundred — commas every 3 digits. (Indian) (International).
Key concepts & formulas
01
**Place value**: digits get their value from position (ones, tens, hundreds, ...).
02
Indian system uses lakhs and crores; International uses millions and billions.
03
Comparing numbers: more digits ⇒ larger; else compare leftmost differing digit.
04
Estimation rounds numbers to check reasonableness.
05
Roman numerals: .