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document.write( "We start by writing first the length to be subtracted\r\n" );
document.write( "from, and under that, we put the length that we are \r\n" );
document.write( "subtracting (cutting) from that length with a minus sign \r\n" );
document.write( "before it. We line everything up nice and neat so that the \r\n" );
document.write( "numbers line up as well as the units ('ft' and 'in') and \r\n" );
document.write( "draw a line underneath, like this:\r\n" );
document.write( "\r\n" );
document.write( " 25ft 8in \r\n" );
document.write( "- 18ft 10in\r\n" );
document.write( "覧覧覧覧覧予r\n" );
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document.write( "Now if we had larger numbers on top we could go ahead and\r\n" );
document.write( "subtract. But we can't. 25 is larger than 18, but 8 is NOT \r\n" );
document.write( "larger than 10. So we must change it so that it is that way.\r\n" );
document.write( "Here's what we do. We: \r\n" );
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document.write( "1. borrow 1 ft from the 25ft making it 24ft. Scratch through\r\n" );
document.write( "the 25ft and write 24ft above it\r\n" );
document.write( "\r\n" );
document.write( " 24ft \r\n" );
document.write( " 25ft 8in \r\n" );
document.write( "- 18ft 10in\r\n" );
document.write( "覧覧覧覧覧予r\n" );
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document.write( "then\r\n" );
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document.write( "2. Think of the 1 ft that we borrowed from the 25ft and remember that we have\r\n" );
document.write( " learned that there are 12 inches in 1 foot. So instead of the 1ft \r\n" );
document.write( " that we borrowed, we must think of that 1ft as 12in instead.\r\n" );
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document.write( "3. Then add that 12in that we are thinking of to the 8in, getting 12+8=20in. \r\n" );
document.write( " Scratch through the 8in and write 20in above it. So now what we write\r\n" );
document.write( " should look like this:\r\n" );
document.write( "\r\n" );
document.write( " 24ft 20in \r\n" );
document.write( " 25ft 8in \r\n" );
document.write( "- 18ft 10in\r\n" );
document.write( "覧覧覧覧覧予r\n" );
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document.write( "4. Now we have a larger number in the top row than in the bottom\r\n" );
document.write( "row in BOTH columns, not just the first one. So we subtract the\r\n" );
document.write( "numbers and bring down the units (ft and in).\r\n" );
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document.write( " 24ft 20in \r\n" );
document.write( " 25ft 8in \r\n" );
document.write( "- 18ft 10in\r\n" );
document.write( "覧覧覧覧覧予r\n" );
document.write( " 6ft 10in\r\n" );
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document.write( "That's our answer:\r\n" );
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document.write( "Edwin \n" );
document.write( "