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The Adding and Subtracting Two-Digit Numbers :(1).
The Adding Two-Digit Numbers -- No Regrouping
(2). The Adding Two-Digit Numbers -- Regrouping(Carrying)
(3). The Subtracting Two-Digit Numbers -- No Regrouping
(4). The Subtracting Two-Digit Numbers -- Regrouping(Carrying)
(2). The Adding Two-Digit Numbers -- Regrouping(Carrying)
(3). The Subtracting Two-Digit Numbers -- No Regrouping
(4). The Subtracting Two-Digit Numbers -- Regrouping(Carrying)
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