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![Find out the digit sums of all numbers from 40 to 70 [Ganita Prakash] - Playing with Digits](https://cdn.teachoo.com/72fe037d-363f-4d33-a079-ebd573b6dbe9/slide19.jpg)
Question 2 - Playing with Digits - Chapter 3 Class 6 - Number Play (Ganita Prakash)
Last updated at June 18, 2025 by Teachoo
Class 6 (Ganita Prakash & Old NCERT)
Chapter 3 Class 6 - Number Play (Ganita Prakash)
- Numbers can Tell us Things, Supercells,
- Supercells
- Supercells in a grid (Page 58)
- Patterns of Numbers on the Number Line, Playing with Digits
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Playing with Digits
- Pretty Palindromic Patterns
- The Magic Number of Kaprekar
- Clock and Calendar Numbers
- Figure it out - Page 64, 65
- Mental Math
- Playing with Number Patterns, and Collatz Conjecture!
- Simple Estimation
- Estimate the answer - Page 70, 71
- Games and Winning Strategies
- Figure it out - Page 72, 73
- Teachoo Questions - MCQs
- Teachoo Questions - Mix
- Teachoo Questions - Assertion Reasoning
- Teachoo Questions - Case Based
Transcript
Question 2 Find out the digit sums of all the numbers from 40 to 70. Share your observations with the class.When calculating the digit sums for numbers from 40 to 70, several observations can be made: The digit sums increase by 1 as you count up within a "decade.” For example: 40 → 4+0 = 4 41 → 4+1 = 5 42 → 4+2 = 6 ...and so on up to 49 (4 + 9 = 13). The pattern resets when the tens digit changes. After the digit sum for 49 is 13, the digit sum for 50 is 5 (5 + 0) This creates a cyclical pattern of steadily increasing sums followed by a sudden drop.
