Question

Evaluate the following by using suitable identities 109×108​

Answer 1

The given product 109×108 can be rewritten as (100+9)×(100+8) and we solve it as follows:
(100+9)(100+8)
=100(100+8)+9(100+8)
=(100×100)+(100×8)+(9×100)+(9×8)
=10000+800+900+72
=11772.
Hence, 109×108=11772.

Hope this will help you ..

Answer 2

(100+9) (100+8)

100(100+8)+9(100+8)

10000+800+900+72

11772