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    The multiplication of integers | 
| Operations with integers II | |
| 4-a . Multiply each number of the magic square by this number. | ||
      
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| 4-b . Multiply each number of the magic square by this number. | |
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       This exercise is similar to the previous one but here you must fill all the cells.  | 
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| Eduardo Barbero Corral | ||
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| Spanish Ministry of Education. Year 2007 | ||
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