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# Prime and Composite Numbers micro-lesson

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## Learning time​

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What's the difference between prime and composite numbers? Here is a list of the first five prime numbers, 2, 3, 5, 7 and 11. Each of them only has two factors, one and itself. The number 2 is the only even prime number. Composite numbers are numbers that have more than two factors, for example, 4 has the factors of 1, 2 and 4. Eight’s factors are 1, 2, 4 and 8. 15 has these factors – 1, 3, 5, 15. 16 has these factors – 1, 2 4, 8 and 16. 4, 9 and 33 are all composite numbers because they all have more than two factors. So, the difference between prime and composite numbers is that prime numbers have only two factors. Composite numbers have three or more factors. Kids earn more screen time by answering fun educational questions.

1) 2
2) 1
3) 3
4) 4

1) 2
2) 3
3) 4
4) 5

1) 2
2) 4
3) 6
4) 8

1) 2
2) 4
3) 6
4) 8

1) 7
2) 4
3) 21
4) 15

1) 2
2) 12
3) 22
4) 32

1) 39
2) 13
3) 29
4) 43

1) 15
2) 13
3) 11
4) 19

1) 33
2) 17
3) 97
4) 61

1) 37
2) 27
3) 57
4) 77

1) 23
2) 27
3) 25
4) 29

1) 31
2) 33
3) 35
4) 39

1) 37
2) 33
3) 35
4) 39

1) 75
2) 73
3) 37
4) 57

1) 67
2) 76
3) 58
4) 85
• #### How many factors must a composite number have?

1) at least 3
2) only 2
3) only 1
4) none
• #### What do all prime numbers have in common?

1) They all have only 2 factors.
2) They are all odd.
3) They all end in 0.
4) They are all even.
• #### Is 33 a prime number?

1) No, because it has 3 or more factors.
2) Yes, because it is odd.
3) Yes, because it only has 2 factors.
4) No, because it only has 2 factors.

1) Yes
2) No

1) No
2) Yes

1) No
2) Yes

1) No
2) Yes

1) No
2) Yes

1) No
2) Yes
• #### Is 1,290 prime?

1) No
2) Yes ## Recreational screen time

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Our micro-courses are developed and delivered by qualified educators from around the world. #### Chris Lindsey

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