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

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8579 + 7249 =

8281 + 4538 =

1546 + 2588 =

3178 + 4608 =

3275 + 7270 =

4938 + 6291 =

5314 + 9966 =

1453 + 7103 =

9093 + 6777 =

5123 + 7580 =

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