Science quiz
Prime numbers from 100 to 200
Twenty one primes sit between 100 and 200. Type them in any order; each drops into its place.
- Format
- Type them all
- Items
- 21 answers
- Limit
- 4:00
- Level
- Hard
- Checked
- 2026.10.03
- Answers
- 21
- Time limit
- 4:00
- Order
- Any order
- Matching
- Case and accents ignored
- Type an answer; it files itself the moment it matches.
- One answer can fill several slots.
- Give up at any time to see what you missed.
- Pause whenever you like (Esc). The board hides while the clock is stopped.
Type every prime number between 100 and 200.
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About this quiz
A prime number has exactly two factors, 1 and itself. To test a number under 200 you only need to try dividing by 2, 3, 5, 7, 11 and 13.
- The first is 101 and the last is 199.
- There are 25 primes below 100 but only 21 in the next hundred.
- No prime between 100 and 200 ends in 5, and 187 is not prime: it is 11 times 17.
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