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

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124 + 596 =

298 + 444 =

421 + 506 =

180 + 674 =

516 + 114 =

507 + 762 =

250 + 306 =

207 + 804 =

794 + 435 =

346 + 471 =

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