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

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4795 - 2361 =

7003 - 6160 =

9111 - 1170 =

9037 - 8542 =

6268 - 4426 =

8966 - 5616 =

6859 - 3113 =

2522 - 2281 =

9775 - 4678 =

8663 - 5270 =

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