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

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7423 - 2904 =

8673 - 6609 =

9813 - 3537 =

5672 - 4368 =

9713 - 2616 =

9167 - 1295 =

9337 - 9211 =

4394 - 1621 =

5683 - 5088 =

3291 - 2687 =

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