In math, when a child understands that certain pairs of mathematical calculations (like addition and subtraction) are opposites, the child has mastered:

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Reversibility is the understanding that objects or sets of operations can be changed, then returned back to their original state. In the context of mathematics, when a child understands that addition and subtraction are inverse operations (e.g., that adding and then subtracting the same number returns to the original number), they are demonstrating an understanding of reversibility.

In Math, When a Child Understands That Certain Pairs of Mathematical