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= 899.75Or = 899 3/4 ••••
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