You can use the first page of this task with this unit, but the second page is better used after/with Unit 2.5 (Subtraction within 100). The task challenges a student to demonstrate fluency in adding and subtracting whole numbers. A student must understand whole numbers and represent and use them in flexible ways, including relating, composing, and decomposing numbers. A student must be able to communicate mathematical reasoning using words, numbers and/or pictures.

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