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posted by Bee on Tuesday, August 30, 2011 at 11:57pm.
I am in 6th grade and have a math problem that I need help with. How can you use four rods that measure 2cm, 5cm, 7cm and 9cm to measure a length of 1cm?
( 5 + 7 ) - ( 9 + 2 ) = 12 - 11 = 1cm
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