Add two 3-digit numbers (bar model)

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

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Add a multiple of 10 to a 3-digit number with a bar model, crossing 100.

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

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

Add a multiple of 10 to a 3-digit number, crossing 100.

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