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

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844 - 505 =

537 - 272 =

651 - 105 =

528 - 466 =

848 - 800 =

918 - 701 =

114 - 110 =

821 - 229 =

898 - 271 =

436 - 239 =

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