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

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5608 + 3084 =

7409 + 2403 =

5131 + 4952 =

6597 + 8116 =

2254 + 2733 =

1611 + 6037 =

5407 + 9565 =

2411 + 6435 =

4767 + 4704 =

9554 + 6981 =

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