Grade+Two+NS+2.1

2.1 Understand and use the inverse relationship between addition and subtraction (e.g., an opposite number sentence for 8 + 6 = 14 is 14 - 6 = 8) to solve problems and check solutions.
 * __Grade Two NS 2.1__**

// 1. Since _ _ _ plus _ _ _ is ten, then ten minus _ _ _ must be _ _ _. 2. Since _ _ _ plus _ _ _ is twelve, then twelve minus _ _ _ is _ _ _ and twelve minus _ _ _ is _ _ _.

1. Since _ _ _ plus _ _ _ equals _ _ _, then _ _ _ minus _ _ _equals _ _ _. 2. Since _ _ _ plus _ _ _ equals _ _ _, then _ _ _ minus _ _ _equals _ _ _, and _ _ _ minus _ _ _ equals _ _ _. //

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