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Arithmetic ability: level two: mental addition of three-digit numbers.

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652 + 871 =

653 + 261 =

559 + 824 =

460 + 651 =

461 + 597 =

625 + 522 =

239 + 335 =

482 + 251 =

344 + 904 =

695 + 539 =

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