Leeanne,
when looking at the phases of the Moon in primary schools, keep the emphasis very much on the appearance of the shadow and the light and how a 3-D object can be lit on one side only by a single light source.
Please note that the children will only be able to observe the Moon showing the correct phases when they are they person holding the styrofoam ball – from the side they will see the same appearance of a half lit sphere, since they are not in the centre of the activity, so it isn’t possible for “While one student moves the Moon around the “Earth,” the others will observe and sketch the phases they see in sequence (New Moon, First Quarter, Full Moon, Last Quarter, etc.).”
See this video for my favourite way to carry this out, which I usually do with second level students. Use the Sun as the light source, and go outside!
https://nightsky.jpl.nasa.gov/download-view.cfm?Doc_ID=329
https://youtu.be/ai9VcMLBiQg?si=voI1gFCBIpwxRKkW