1. Example-1
1. which of the following is a composite number 13,19,22,31
Solution:
| Number | Factors | Prime or Composite? | | 13 | 1,13 | Prime | | 19 | 1,19 | Prime | | 22 | 1,2,11,22 | Composite | | 31 | 1,31 | Prime |
Composite numbers : 22
2. which of the following is a composite number between 40 and 60
Solution:
| Number | Factors | Prime or Composite? | | 40 | 1,2,4,5,8,10,20,40 | Composite | | 41 | 1,41 | Prime | | 42 | 1,2,3,6,7,14,21,42 | Composite | | 43 | 1,43 | Prime | | 44 | 1,2,4,11,22,44 | Composite | | 45 | 1,3,5,9,15,45 | Composite | | 46 | 1,2,23,46 | Composite | | 47 | 1,47 | Prime | | 48 | 1,2,3,4,6,8,12,16,24,48 | Composite | | 49 | 1,7,49 | Composite | | 50 | 1,2,5,10,25,50 | Composite | | 51 | 1,3,17,51 | Composite | | 52 | 1,2,4,13,26,52 | Composite | | 53 | 1,53 | Prime | | 54 | 1,2,3,6,9,18,27,54 | Composite | | 55 | 1,5,11,55 | Composite | | 56 | 1,2,4,7,8,14,28,56 | Composite | | 57 | 1,3,19,57 | Composite | | 58 | 1,2,29,58 | Composite | | 59 | 1,59 | Prime | | 60 | 1,2,3,4,5,6,10,12,15,20,30,60 | Composite |
Composite numbers : `40,42,44,45,46,48,49,50,51,52,54,55,56,57,58,60`
There are 16 composite numbers between 40 and 60
3. which of the following is a composite number 33 81 93 97
Solution:
| Number | Factors | Prime or Composite? | | 33 | 1,3,11,33 | Composite | | 81 | 1,3,9,27,81 | Composite | | 93 | 1,3,31,93 | Composite | | 97 | 1,97 | Prime |
Composite numbers : 33,81,93
This material is intended as a summary. Use your textbook for detail explanation.
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