document.write( "Question 237583: The sum of the digits in the tens place of all two digit whole numbers is\r
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document.write( "(a) 100 (b) 101 (c) 450 (d) 901 (e) 990 \n" );
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Algebra.Com's Answer #174703 by vleith(2983)![]() ![]() ![]() You can put this solution on YOUR website! There are 10 2 digit numbers that start with 1 (10,11,12...19) \n" ); document.write( "There are 10 2 digit numbers that start with 2 (20,21,...29) \n" ); document.write( "Do this all the way up to the 10 2 digit numbers that start with 9 (90,91...99)\r \n" ); document.write( "\n" ); document.write( "Now sum them \n" ); document.write( "10*1= 10 \n" ); document.write( "10*2=20 \n" ); document.write( "10*3=30 \n" ); document.write( "... \n" ); document.write( "10*9= 90 \n" ); document.write( "So you can see that sum is 10 + 20 + 30 + 40 + ...+ 80 + 90 \n" ); document.write( "Adding them up, you get 450 \n" ); document.write( " |