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

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7538 - 6731 =

6995 - 2553 =

7594 - 2936 =

6123 - 4534 =

7674 - 3819 =

7393 - 6135 =

8587 - 6913 =

2521 - 2382 =

7391 - 1069 =

5283 - 3466 =

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