The ability to mentally understand that 1 + 3 = 4 and 4 - 1 = 3 occurs in which stage of cognitive development?

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By 7 to 8 years of age,the child is able to retrace a process (reversibility)and has the skills necessary for solving mathematical problems.This stage is called concrete operations.The formal operations stage deals with abstract reasoning and does not occur until adolescence.Thinking in the intuitive stage is based on immediate perceptions.A child in this stage often solves problems by random guessing.

The Ability to Mentally Understand That 1 + 3 =