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

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1900 - 1335 =

4832 - 4005 =

9285 - 4276 =

4942 - 3325 =

7518 - 7052 =

4905 - 3437 =

8899 - 1831 =

7027 - 5629 =

6697 - 5169 =

6585 - 1196 =

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