Max had work from his school. Several of the problems had him use conversion factors. I showed him how to work out a process called "factor labeling", which had him write relationships between different units of measurement in order to cancel one unit to get to another. For example, if a teaspoon holds 5 ml, how many spoonfuls are in a 2 liter cup? I showed him the process to convert the units, although it was a little confusing for him to understand. He did a good job of listening!