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

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9408 + 3087 =

1387 + 9522 =

3225 + 3942 =

6041 + 1644 =

8839 + 4116 =

3117 + 9863 =

3262 + 6343 =

8482 + 7984 =

8073 + 5285 =

3410 + 1661 =

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