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Interactive Portal-Book of Self-Development Methods

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

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7443 - 4728 =

6626 - 1245 =

7843 - 1930 =

5814 - 1983 =

7930 - 3739 =

9161 - 4103 =

6561 - 3295 =

7053 - 4367 =

7579 - 4394 =

7683 - 1443 =

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metodorf.com



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