Red bars help children to recognize the differences in size and length. The child must place the bars in the proper sequence from the shortest (ten centimeters in length) to the longest (one meter). The exercise shows very clear the error in the order, so the child can be easily corrected. It also gives the teacher the opportunity to introduce the child to the terms: short, short and long, longer. This material will provide a child a sensory basis for learning that will be very useful for mathematics.
The Red Bars
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