Hi Beth! This recipe I used with three kids. They all had plenty to use but doing it with a group that large I think you’d need to make several batches. If it’s easier you can divided it into small individual sized portions to make with your large group. It gives each kid a small amount for themselves and they can even make it themselves by mixing in t a plastic bag. For these individual sized activities I usually do 4 Tablespoons of water, 1 Tablespoon white glue, and 1 heaping Tablespoon of Borax into a plastic baggie and let kids mix. I’d test it and see if this enough for each kid. Hope that helps!