How to evaluate 999 multiply 999 without actual multiplication? 

Thrilokesh Guggilla's image
Thrilokesh Guggilla
Sept. 29, 2017, 5:23 p.m.

Answers!

Davneet Singh's image
Davneet Singh
July 11, 2017, 6:56 p.m.

Hi Thrilokesh,

Hint - https://www.teachoo.com/1060/414/Ex-2.5-2---Evaluate-the-products-without-multiplying-directly/category/Ex-2.5/

999 × 999 = (1000  - 1) × (1000 - 1)

= (1000 - 1)2

= 10002 + 12 - 2 × 1000 × 1

= 1000000 + 1 - 2000

= 998001

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