Perfect numbers are very rare. Abundant Numbers Abundant numbers are those numbers where the sum of the proper factors is greater than the number itself. The number 12 is the first abundant number. There are only 21 abundant numbers between 12 and 100. Defective numbers are sometimes called deficient numbers.
Most numbers are defective because they have very few factors.
All prime numbers are defective. Distribute the activity sheets and have students use the concepts they have learned to complete the activity. 76 abundant 10. Activity Sheets Click here to view and print the activity sheets. To view the activity sheets, you need Adobe Acrobat Reader.