1.

30.5*29.5, Evaluate the given product without actual multiplication.

Answer»

Solution :

GIVEN 30.5 × 29.5

= ( 30 + 0.5 )( 30 - 0.5 )

= ( 30 )² - ( 0.5 )²

[ By the ALGEBRAIC identity ,

( a + b )( a - b ) = a² - b² ]


= 900 - 0.25

= 899.75

Or

= 899 3/4

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