In order to take a field trip to a science museum, ms speedi's students sold scented pencils for $1. in the classroom, rowena tried to put the $1 s into 2 equal piles and found one left over at the end. when polly tried putting the bills in 3 equal piles, she also ended up with one extra bill. frustrated, they tried 4, 5,and 6 equal piles and each time had $1 left over. finally rowena put all the bills evenly into 7 equal piles, and none were left over.