Marco picked up 9 rocks. He picked up 2 of them on his way to school. He picked up the rest on his way home. How many rocks did Marco pick up on his way home?

1 Answer
Mar 2, 2018



If Marcus picked up 9 rocks, and 2 were on his way to school, that means that the rest were left for the way home. So, you can use the equation #9-2# to figure out how many were picked up while walking home. Since #9-2=7#, you know that #7# rocks were picked up on the way home.