Add two 3-digit multiples of 10 (timed)

Add two 3-digit multiples of 10 not crossing the tens or hundreds boundaries.

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Add two 3-digit numbers not crossing ten or hundred with bar models.

Add two 3-digit numbers not crossing ten or hundred.

Add two 3-digit multiples of 10 not crossing the tens or hundreds boundaries.

Fill in the missing number in the written addition question.

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