This video takes us up, up and away in a hot air balloon! As we watch hot air balloons flying off, we can practice our subtraction. Help Chen solve a few subtraction word problems and discover how key words tell us what to do! Words like "less" and "left over" tell students which operation to use and how to set up subtraction equations. We practice modelling subtraction with linking cubes and drawings. Remember, subtraction is best shown by crossing out or erasing whatever is being taken away.