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Question 3 - Figure it out - Page 10, 11 - Chapter 1 Class 8 - A Square and a Cube (Ganita Prakash)
Last updated at July 30, 2025 by Teachoo
Class 8 (Ganita Prakash & Old NCERT)
Chapter 1 Class 8 - A Square and a Cube (Ganita Prakash)
- Introduction
- Square Numbers
- Perfect Squares - and its Properties
- Perfect Squares - and its Patterns
- Square Root
- Smallest number multiply or divide to get perfect square
- Estimating Square Root
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Figure it out - Page 10, 11
- Cubic Numbers
- Perfect Cubes - and its Properties
- Perfect Cubes - and its Patterns
- Cube Root
- Smallest number multiply or divide to get perfect cube
- A pinch of History
- Figure it out - Page 16, 17
Transcript
Question 3 Given 1252 = 15625, what is the value of 1262? (i) 15625 + 126 (ii) 15625 + 262 (iii) 15625 + 253 (iv) 15625 + 251 (v) 15625 + 512 To find 1262, we must add the 126th consecutive odd number to 1252. Finding 126th odd number The 1st odd number is 1, 2nd odd number is 3, 3rd number is 5, …, 6th odd number is 11 and so on. Thus, nth odd number would be 2n – 1 And, 126th odd number is 2(126) − 1 = 72 − 1 = 251 Calculating 1262 1262 = 1252 + 251 = 15625 + 251 So, option (iv) is correct
