Towards Level 5 - Number

0.5  |  1.0  |  1.25  |  1.5  |  1.75  |  2.0  |  2.25  |  2.5  |  2.75  |  3.0  |  3.25 3.5  |  3.75  |  4.0  |  4.25  |  4.5  |  4.75  |  5.0

       
4.25 Which zeros matter? 
       
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4.5 Base 2 notation
       
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4.75 Subtracting negative numbers
       
 
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4.75 A negative multiplied by a negative
       
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5.0 Conceptual obstacles when multiplying and dividing by numbers less than 1
       
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