CBSE · Class 6-12

Class 6 · Ganita Prakash

Unit 3 · Class 6Ganita Prakash

Number Play

Counting, place value, comparisons, and mental strategies for large numbers.

Lessons

4 concepts

1
Indian vs International Place Value
Indian: ..., crore, lakh, thousand, hundred, ten, one — commas after 3, 5, 7 digits from right. International: ..., billion, million, thousand, hundred — commas every 3 digits. $30\,50\,72\,145$ (Indian) $= 30,572,145$ (…
2
Comparing & Ordering
Count digits first. If same, compare from left, digit by digit.
3
Estimation
Round to nearest 10, 100, or 1000. $487 + 621 \approx 500 + 600 = 1100$ ; exact $1108$ .
4
Roman Numerals
Add letters in decreasing order: $XVI=16$ . Subtract when smaller precedes larger: $IX=9, XL=40, XC=90, CD=400, CM=900$ .

Skills to practise

Skill · medium

Number Play — Practice