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Sue wants 1/2 of a rectangular pan of cornbread.dena wants 1/3 of the same cornbread so that each girl gets the size portion she wants

Sue wants 12 of a rectangular pan of cornbreaddena wants 13 of the same cornbread so that each girl gets the size portion she wants class=

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in 3rds so Dena gets 1/3 and Sue gets 2/3 which is half
ahmaddintewellington
first your going to add I/2+1/3 but u can't add like that keep, change, flip. 

KEEP  CHANGE     FLIP
1/2         +=-           1/3-3/1      1/2-3/1= -2u1/2

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