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

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6208 - 3284 =

4942 - 4703 =

5426 - 4906 =

7876 - 2585 =

3553 - 2267 =

7086 - 5598 =

6651 - 5901 =

9294 - 8316 =

8119 - 1654 =

5099 - 2125 =

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