Addition Facts to 20 - 搜索视频

2nd Grade Math 3.2, Practice Addition Facts to 20, Addition Strategies

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2nd Grade Math 3.2, Practice Addition Facts to 20, Addition Strategies

We can find a sum by counting on, changing the order of the addends, using doubles facts, and remembering that adding 0 to a number won't change the number. When we add 0 to a number, the number keeps its identity. Each side of an equal sign will show the same amount. We can write the answer to the right of the equal sign, or to the left of the ...

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