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Prime Numbers 1-100

There are 25 prime numbers that are less than one hundred. How many can you name in 45 seconds?
Quiz by johnnyaitch
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Last updated: October 11, 2019
First submittedNovember 11, 2011
Times taken34,700
Average score72.0%
Rating4.52
0:45
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0
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Prime #
2
3
5
7
11
Prime #
13
17
19
23
29
Prime #
31
37
41
43
47
Prime #
53
59
61
67
71
Prime #
73
79
83
89
97
+2
Level 11
Apr 10, 2016
Nailed it with approximately 1:20.0000000000000000 left :|
+3
Level 32
May 21, 2016
This should be 30 seconds
+6
Level 75
Nov 8, 2022
Feel free to complete it in 30 seconds :)
+4
Level 56
Apr 13, 2018
Funk whiz
+2
Level 50
Apr 30, 2022
guys fun fact:Any number above two that is a even number is a composite number meaning it’s not a prime number
+9
Level 71
Oct 25, 2022
Fun fact: because half of all numbers are divisible by 2, we know that less than half of all numbers are prime. We also know that 1/3 of the remaining 1/2 are not prime because they are divisible by 3, so 1/2 + 1/6 of numbers are not prime-which is 2/3. We also know that numbers divisible by 5 aren't prime! So of the remaining 1/3 potential prime numbers, 1/5 are not prime, meaning 1/3*1/5 = 1/15. 1/15+2/3 = 11/15...
+1
Level 50
Nov 8, 2022
Still though, crossing almost half is decent
+1
Level 42
Nov 9, 2022
thats pretty common knowledge tho
+1
Level 49
Nov 9, 2022
5 is also a factor of 10 so no prime number (except 5 itself) can ever end with 5. Therefore all prime numbers larger than 5 end with 1,3,7 or 9.
+1
Level 86
Oct 25, 2022
Great quiz! Could probably be done in less than 30 seconds.
+1
Level 56
Nov 8, 2022
I barely did it in under 30 seconds first try. But I think this isn't necessarily a speed quiz, so 45 seconds is more than doable
+1
Level 21
Nov 9, 2022
i tried this 20 times and i finally got it cause idk prime numbers
+1
Level 32
Nov 11, 2022
bro america taught me that all composite numbers were prime numbers im dead :(
+1
Level 21
Nov 13, 2022
Wow! I got them all in 23 seconds!