2.oa.4 Worksheets

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Previous Standard Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.
Next Standard 100 can be thought of as a bundle of ten tens - called a "hundred."
Operations and Algebraic Thinking Work with equal groups of objects to gain foundations for multiplication. 4Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.