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Is It A Prime Number, Yes or No? Jonathan Brinkerhoff

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There are different kinds of numbers. You know about whole numbers, like 5, and fractions like ⅓. You know about odd and even numbers. Today, we’ll learn about another kind of number – prime numbers.

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I’m going to show you some numbers. Some are prime and some are not. When you think you know what makes a number prime or not, raise your hand.

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3 is a prime number 3 = 1 X 3

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4 is not a prime number 4 = 1 X 4 4 = 2 X 2

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5 is a prime number 5 = 1 X 5

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6 is not a prime number 6 = 1 X 6 6 = 2 X 3

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7 is a prime number 7 = 1 X 7

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12 is not a prime number 12 = 1 X = 2 X 6 12 = 3 X 4

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13 is a prime number 13 = 1 X 13

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15 is not a prime number 15 = 1 X = 3 X 5

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What do you think a prime number is?

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You figured out that a prime number has only two factors, itself and 1.

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Let’s Practice! If it’s a prime number If it’s not a prime number

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You can correctly identify prime numbers.

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2 is a prime number 2 = 1 X 2

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9 is not a prime number 9 = 1 X 9 9 = 3 X 3

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11 is a prime number 11 = 1 X 11

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14 is not a prime number 14 = 1 X = 2 X 7

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What do you think a prime number is?

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