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

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838 + 717 =

853 + 404 =

788 + 875 =

215 + 889 =

542 + 967 =

387 + 158 =

154 + 585 =

416 + 649 =

168 + 822 =

503 + 943 =

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