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

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7838 - 4828 =

2484 - 1242 =

4116 - 3289 =

7482 - 6159 =

8189 - 4769 =

8304 - 3334 =

6144 - 1270 =

6097 - 3138 =

6429 - 5826 =

4508 - 1970 =

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