Find the prime and composite numbers between 1 to 100. Hint: Step 1 : Cross out 1. Step 2 : Cross out all the even numbers except 2. Step 3 : Cross out all the multiples of 3 except 3. Step 4 : Cross out all the multiples of 5 except Step 5 : Cross out all the multiples of 7 except 7. Prime Numbers (which are not crossed out): …………………………… Composite Numbers (which are crossed out): …………………………..
Answers
Given : numbers between 1 to 100
To Find : prime and composite
Solution:
a number that is divisible only by itself and 1 is prime
Prime Numbers :
2 , 3 , 5 , 7 , 11 , 13 , 17 , 19 , 23 , 29 , 31 , 37 , 41 , 43 , 47 , 53 , 59 , 61 , 67 , 71 , 73 , 79 , 83 , 89 , 97
number having more than 2 factor is composite .
Composite number :
4 , 6 , 8 , 9 , 10 , 12 , 14 , 15 , 16 , 18 , 20 , 21 , 22 , 24 , 25 , 26 , 27 , 28 , 30 , 32 , 33 , 34 , 35 , 36 , 38 , 39 , 40 , 42 , 44 , 45 , 46 , 48 , 49 , 50 , 51 , 52 , 54 , 55 , 56 , 57 , 58 , 60 , 62 , 63 , 64 , 65 , 66 , 68 , 69 , 70 , 72 , 74 , 75 , 76 , 77 , 78 , 80 , 81 , 82 , 84 , 85 , 86 , 87 , 88 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 98 , 99 , 100
1 is neither composite not prime
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