Many of the difficulties children have with measurement and estimation are caused by a lack of direct sensory experiences with the qualities they are asked to measure: length, weight, area, etc. This is especially true of the visually impaired child. While textbooks will provide rules and instructions for measuring, it is up to the teacher to provide the direct sensory experiences that will help the child understand the concepts he or she will later learn to measure. A model for teaching the concept of length in grades K through 8 is provided, with additional suggestions on teaching children to understand the concepts of area, temperature, capacity, weight, volume, angles and money or value.
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