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Your number is 419,161.
\n" ); document.write( "Placing the decimal point there helps to understand how to work the problem.
\n" ); document.write( "The $10,000 digit would be 5 positions to the left of the decimal point.
\n" ); document.write( "That digit would be the 1 digit.
\n" ); document.write( "Since the next digit (the thousands digit) is a 9, round the 1 to a 2 and and then make all digits to the right of it equal to 0.
\n" ); document.write( "$419,161.00 would round up to $420,000
\n" ); document.write( "If you have a calculator, you could simply divide $419,161.00 by $10,000 to get 41.9161.
\n" ); document.write( "You would then round that up to 42 and multiply it by 10,000 to get $420,000.
\n" ); document.write( "You could also use Scientific Notation to help you with it.
\n" ); document.write( "$419,161 is equal to 41.91671 * 10^4.
\n" ); document.write( "That rounds up to 42 * 10^4.
\n" ); document.write( "That's the same technique used by dividing by 10,000 and rounding up and then multiplying by 10,000 again.
\n" ); document.write( "Understanding how the number positions work helps also.
\n" ); document.write( "The rightmost digit is the ones digit (multiply digit by 1).
\n" ); document.write( "The next one to the left of that is the tens digit (multiply digit by 10).
\n" ); document.write( "The next one to the left of that is the hundreds digit (multiply digit by 100).
\n" ); document.write( "The next one to the left of that is the thousands digit (multiply digit by 1,000).
\n" ); document.write( "The next one to the left of that is the ten thousands digit (multiply digit by 10,000).
\n" ); document.write( "The next one to the left of that is the hundred thousands digit (multiply digit by 100,000).
\n" ); document.write( "Your number if $419,161.
\n" ); document.write( "That would be:
\n" ); document.write( "4 * 100,000
\n" ); document.write( "+ 1 * 10,000
\n" ); document.write( "+ 9 * 1,000
\n" ); document.write( "+ 1 * 100
\n" ); document.write( "+ 6 * 10
\n" ); document.write( "+ 1 * 1
\n" ); document.write( "Note that the 1 after the 4 is the 10,000 digit.
\n" ); document.write( "When you round to the nearest 10,000, then you are rounding to that digit.
\n" ); document.write( "If the next digit is 5 or greater, then you round up 1 digit.
\n" ); document.write( "If the next digit is less than 5, then you leave the digit as is.
\n" ); document.write( "When round to the 10,000 digit, then all digits to the right of that become 0.\r
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