Four-year-olds generally can't understand that subtraction undoes addition, as in 2 + 3 = 5 and 5 - 2 = 3. This is because their cognitive structures are

Name: Four-year-olds generally can't understand that subtraction undoes addition, as in 2 + 3 = 5 and 5 - 2 = 3. This is because their cognitive structures are
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Four-year-olds typically lack the cognitive ability to understand reversibility, which is the concept that operations can be undone, such as subtraction undoing addition.

Four-Year-Olds Generally Can't Understand That Subtraction Undoes Addition, as in 2