Prime numbers from 1 to 100

Chapter 3 Class 6 Playing with Numbers
Concept wise

Let’s find factors of all numbers from 1 to 100 and check whether they are prime or not.

 Number Factors Prime or Composite 1 1 Neither prime nor composite 2 1, 2 Prime 3 1, 3 Prime 4 1, 2, 4 Composite 5 1, 5 Prime 6 1, 2, 3, 6 Composite 7 1, 7 Prime 8 1, 2, 4, 8 Composite 9 1, 3, 9 Composite 10 1, 2, 5, 10 Composite 11 1, 11 Prime 12 1, 2, 3, 4, 6, 12 Composite 13 1, 13 Prime 14 1, 2, 7, 14 Composite 15 1, 3, 5, 15 Composite 16 1, 2, 4, 8, 16 Composite 17 1, 17 Prime 18 1, 2, 3, 6, 9, 18 Composite 19 1, 19 Prime 20 1, 2, 4, 5, 10, 20 Composite 21 1, 3, 7, 21 Composite 22 1, 2, 11, 22 Composite 23 1, 23 Prime 24 1, 2, 3, 4, 6, 8, 12, 24 Composite 25 1, 5, 25 Composite 26 1, 2, 13, 26 Composite 27 1, 3, 9, 27 Composite 28 1, 2, 4, 7, 14, 28 Composite 29 1, 29 Prime 30 1, 2, 3, 5, 6, 10, 15, 30 Composite 31 1, 31 Prime 32 1, 2, 4, 8, 16, 32 Composite 33 1, 3, 11, 33 Composite 34 1, 2, 17, 34 Composite 35 1, 5, 7, 35 Composite 36 1, 2, 3, 4, 6, 9, 12, 18, 36 Composite 37 1, 37 Prime 38 1, 2, 19, 38 Composite 39 1, 3, 13, 39 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 61 1, 61 Prime 62 1, 2, 31, 62 Composite 63 1, 3, 7, 9, 21, 63 Composite 64 1, 2, 4, 8, 16, 32, 64 Composite 65 1, 5, 13, 65 Composite 66 1, 2, 3, 6, 11, 22, 33, 66 Composite 67 1, 67 Prime 68 1, 2, 4, 17, 34, 68 Composite 69 1, 3, 23, 69 Composite 70 1, 2, 5, 7, 10, 14, 35, 70 Composite 71 1, 71 Prime 72 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 Composite 73 1, 73 Prime 74 1, 2, 37, 74 Composite 75 1, 3, 5, 15, 25, 75 Composite 76 1, 2, 4, 19, 38, 76 Composite 77 1, 7, 11, 77 Composite 78 1, 2, 3, 6, 13, 26, 39, 78 Composite 79 1, 79 Prime 80 1, 2, 4, 5, 8, 10, 16, 20, 40, 80 Composite 81 1, 3, 9, 27, 81 Composite 82 1, 2, 41, 82 Composite 83 1, 83 Prime 84 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84 Composite 85 1, 5, 17, 85 Composite 86 1, 2, 43, 86 Composite 87 1, 3, 29, 87 Composite 88 1, 2, 4, 8, 11, 22, 44, 88 Composite 89 1, 89 Prime 90 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 Composite 91 1, 7, 13, 91 Composite 92 1, 2, 4, 23, 46, 92 Composite 93 1, 3, 31, 93 Composite 94 1, 2, 47, 94 Composite 95 1, 5, 19, 95 Composite 96 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96 Composite 97 1, 97 Prime 98 1, 2, 7, 14, 49, 98 Composite 99 1, 3, 9, 11, 33, 99 Composite 100 1, 2, 4, 5, 10, 20, 25, 50, 100 Composite

Inorder to find prime numbers from 1 to 100, we do not write factors of all of them.

We use another method - Check how to find Prime numbers from 1 to 100

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