Everyone knows some ghosts are helpful spirits, they may even help with math! In this high-interest volume, a unique mix of eerie info and math exercises, young mathematicians can practice their subtraction skills using illustrated ghost models as well as hone their mental math...
Everyone knows some ghosts are helpful spirits, they may even help with math! In this high-interest volume, a unique mix of eerie info and math exercises, young mathematicians can practice their subtraction skills using illustrated ghost models as well as hone their mental math...