Mary bought 
m of lace. She used 
m of lace for her new dress. How much lace is left with her?
Length of lace bought by Mary 
Length of lace Mary used 
Length of lace left with Mary = length of lace bought by Mary – length of lace used
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Mary bought m of lace. She used m of lace for her new dress. How much lace is left with her?
Length of lace bought by Mary
Length of lace Mary used
Length of lace left with Mary = length of lace bought by Mary – length of lace used