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

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758 + 727 =

513 + 938 =

408 + 306 =

650 + 182 =

564 + 494 =

290 + 302 =

663 + 669 =

749 + 837 =

358 + 478 =

846 + 930 =

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