My students were given 30 packing ‘bits’ which are now biodegradable and made of corn starch instead of foam. These packing ‘bits’ are stuck together simply by wetting the ends and holding them together for a short time.
Each child was given 30 pieces to construct a model of something of their choice. If new pieces were requested the children had to ‘count on’ and record the amount they were using. Each child had to construct their model, and when completed draw their model ensuring their diagram / drawing displayed the correct amount of packing pieces.