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

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4461 + 9409 =

5137 + 2206 =

9747 + 5457 =

5900 + 5380 =

8668 + 3095 =

6690 + 3440 =

7012 + 7134 =

3815 + 7714 =

2436 + 6449 =

6348 + 7246 =

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