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| =Additional Information= | | =Additional Information= |
| ==Useful websites== | | ==Useful websites== |
| + | http://www.ditutor.com/natural_number/types_numbers.html <br> |
| + | http://www.purplemath.com/modules/numtypes.htm <br> |
| + | http://www.shmoop.com/number-types/different-number-types.html <br> |
| + | |
| ==Reference Books== | | ==Reference Books== |
| | | |