Question

find 249×251 without actual multiplication.

Answer 1

Hello dear!!!
Here's your answer....

We have to use formulas....

249×251
(250-1)(250+1)
It is in the form of (a-b)(a+b)
(250)^2 - (1)^2
62500-1
62499
This is the answer...

62499 is the product of 249×251.




Hope this helps you
:) :) :)

Answer 2

249 x 251
(200x49)(200+52)

(a+b)(a+c) = a sq.+ a(b+ c) + bc

200 x 200 + 200 (49 + 51) + 49 x 51
40000 + 200 x 100 + 2499
40000 + 20000 + 2499
62499