Parker chews 4 pieces of gum a day.  A pack of gum has 15 pieces of chewing gum per pack.  How many packs of gum will he need to last him 30 days?
How many pieces of gum will Parker chew over 30 days? ** He chews 4 pieces of gum a day so over 30 days he will chew 4*30 = <<4*30=120>>120 pieces of gum
How many packs of gum will Parker need to last him 30 days? ** Each pack of gum holds 15 pieces and he needs 120 pieces for the month so he will need 120/15 = <<120/15=8>>8 packs of gum
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