Prime and Composite Numbers
Prime and Composite Numbers
Prime and Composite Numbers:
We are now familiar with the factors of a number. Observe the number of factors of a few numbers arranged in this table.
| Numbers | Factors | Number of Factors |
1 2 3 4 5 6 7 8 9 10 11 12 | 1 1,2 1,3 1,2,4 1,5 1,2,3,6 1,7 1,2,4,8 1,3,9 1,2,5,10 1,11 1,2,3,4,6,12 | 1 2 2 3 2 4 2 4 3 4 2 6 |
We find that (a) The number 1 has only one factor (i.e. itself)
(b) There are numbers, having exactly two factors 1 and the number itself. Such number are 2,3,5,7,11 etc. These numbers are prime numbers.
The numbers other than 1 whose only factors are 1 and the number itself are called prime numbers.
(c) There are numbers having more than two factors like 4, 6, 8, 9, 10 and so on.
These numbers are composite numbers.
Numbers having more than two factors are called composite numbers.
| 1 is neither a prime nor a composite number |
Which of the following numbers are co- prime? | |||
| Right Option : C | |||
| View Explanation | |||
The greatest 2- digit prime number is ______ | |||
| Right Option : D | |||
| View Explanation | |||
__________ has only two factors: 1 and itself. | |||
| Right Option : A | |||
| View Explanation | |||
Students / Parents Reviews [10]
Abhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Om Umang
10thMy experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
7thA marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
Archit Segal
7thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
10thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
Eshan Arora
8thBeing a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
Prisha Gupta
8thIt was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
Cheshta
10thI have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
Yatharthi Sharma
10thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thMy experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
