The inverse operation of subtraction is addition.
When you subtract a number, you are essentially taking away a certain value from another number. To ‘undo’ this action and return to the original value, you use addition. For example, if you have the equation 10 – 4 = 6, to find the original number (10), you can add the number you subtracted (4) back to the result (6): 6 + 4 = 10.
In summary, subtraction and addition are opposites; while subtraction removes a value, addition combines values together, allowing you to revert to the original amount.