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Here are some tips for Long Addition to 1000, which aligns with California state standards:

Long Addition

Long addition is nothing more than a series of simple addition problems. Simply add up each column of numbers from the right to the left. If the sum of any column is 10 or more, add 1 to the next column.

To succeed within the time limit, however, you must solve these problems in your head. If you try to write out the problems on a piece of paper, you will probably run out of time.

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