Observe the child playing with containers and water or sand (or other small items, such as blocks).
No elicitation is needed.
The child will naturally experiment with filling and dumping, usually repeatedly. Having control over making things change in appearance is fun.
Encourage parents to give their child utensils and containers to experiment in the tub. Parents can encourage their child to watch and help as they prepare meals. Have a small creamer pitcher for the child to use for pouring and let the child observe and help as you make servings. Seeing how things start as a whole and are divided up provides a foundation for understanding many math foundations.
North Carolina Department of Public Instruction, 2015
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