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

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742 + 982 =

586 + 980 =

620 + 200 =

388 + 462 =

859 + 217 =

102 + 461 =

474 + 438 =

337 + 185 =

210 + 714 =

281 + 211 =

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