## Prime Number

Published in: Mathematics
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• ### Debarun S

• Kolkata
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This presentation helps students to have very good idea about prime numbers and how to come to the conclusion whether a number is prime or not.

• 1
Prime Numbers Some Simple Tips and Reminders
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Definitions Even Numbers — Any number that can be divided by 2 Odd Numbers — Any number that cannot be divided by 2 Composite Number — An integer that can be divided by at least one Other number (a factor) other than itself
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Definitions Prime Number — An integer whose only factors are 1 and itself. Factor — a number that can divide another number without a remainder. Prime Factors — an expression of numbers that divides another integer without a remainder where all the factors are prime.
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What numbers are prime? Let's look at a number grid from 1 to 1 00 and see how they were discovered.
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How You Do It Take out the number 1 because it is a special number 1 11 21 31 41 51 61 71 81 91 2 12 22 32 42 52 62 72 82 92 3 23 33 43 53 63 73 83 93 4 14 24 34 44 54 64 74 84 94 5 15 25 35 45 55 65 75 85 95 6 26 36 46 56 66 76 86 96 7 17 27 37 47 57 67 77 87 97 8 18 28 38 48 58 68 78 88 98 9 19 29 39 49 59 69 79 89 99 10 20 30 40 50 60 70 80 90 IOO
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How You Do It Take out the number 1 because it is a special number 11 21 31 41 51 61 71 81 91 2 12 22 32 42 52 62 72 82 92 3 23 33 43 53 63 73 83 93 4 14 24 34 44 54 64 74 84 94 5 15 25 35 45 55 65 75 85 95 6 26 36 46 56 66 76 86 96 7 17 27 37 47 57 67 77 87 97 8 18 28 38 48 58 68 78 88 98 9 19 29 39 49 59 69 79 89 99 10 20 30 40 50 60 70 80 90 IOO
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How You Do It Take out numbers that have a composite factor of 2 11 21 31 41 51 61 71 81 91 2 12 22 32 42 52 62 72 82 92 3 23 33 43 53 63 73 83 93 4 14 24 34 44 54 64 74 84 94 5 15 25 35 45 55 65 75 85 95 6 26 36 46 56 66 76 86 96 7 17 27 37 47 57 67 77 87 97 8 18 28 38 48 58 68 78 88 98 9 19 29 39 49 59 69 79 89 99 10 20 30 40 50 60 70 80 90 IOO
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Take out numbers that have a composite factor of 2 31 23 33 43 63 93 You DO It 55 29 39 49 99
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Take out numbers that 21 have a composite 31 factor of 3 23 33 43 63 93 You DO It 55 29 39 49 99
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31 Take out numbers that have a composite factor of 5 23 43 55 29 49
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23 31 43 Take out numbers that have a composite factor of 5 29 49
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23 31 43 Take out numbers that have a composite factor of 7 29 49
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How Do We Know They Are Prime? Composite numbers can be placed into varying types of rectangles Prime numbers cannot Let's look at that...
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saqcunN Θωμα

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