Primes Under 50 — Set 99
| 7 | 3 | 4 | 7 | 2 | 9 | 2 | 3 | 3 | 8 | 3 | 0 |
| 1 | 5 | 0 | 7 | 8 | 6 | 2 | 2 | 9 | 6 | 6 | 8 |
| 1 | 4 | 2 | 8 | 7 | 6 | 3 | 9 | 1 | 5 | 7 | 5 |
| 7 | 0 | 9 | 7 | 6 | 2 | 9 | 2 | 8 | 0 | 3 | 4 |
| 6 | 8 | 2 | 0 | 3 | 3 | 8 | 2 | 8 | 4 | 5 | 1 |
| 5 | 2 | 6 | 5 | 3 | 8 | 9 | 8 | 1 | 8 | 9 | 3 |
| 8 | 7 | 0 | 5 | 7 | 8 | 4 | 4 | 7 | 8 | 1 | 7 |
| 6 | 8 | 1 | 3 | 0 | 6 | 0 | 9 | 9 | 7 | 0 | 2 |
| 4 | 4 | 7 | 4 | 4 | 2 | 4 | 3 | 0 | 8 | 1 | 5 |
| 3 | 4 | 7 | 8 | 6 | 0 | 5 | 7 | 8 | 9 | 3 | 5 |
| 9 | 5 | 8 | 6 | 2 | 9 | 5 | 2 | 8 | 8 | 0 | 4 |
| 8 | 1 | 8 | 7 | 4 | 5 | 9 | 5 | 4 | 3 | 5 | 1 |
Numbers to Find
- 854
- 35
- 6790
- 4909
- 117
- 650
- 20
- 8451
Show answer key
- : 11,1 (down)
- : 9,11 (right)
- : 4,3 (left)
- : 6,6 (diagonal-down-right)
- : 0,1 (down)
- : 9,1 (down)
- : 1,5 (diagonal-down-right)
- : 8,4 (right)
Activity Notes
Find all prime numbers under 50 in these prime number search puzzles. Perfect introduction to prime number recognition.
Prime Numbers Under 50
This puzzle features all prime numbers less than 50: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47. Mastering recognition of these fundamental primes forms the foundation for all advanced prime work. These puzzles build automaticity with small primes, essential for stronger mathematical thinking.
The 15 primes under 50 represent the core set that most mathematical work references. Becoming fluent with these specific numbers dramatically improves your overall number sense and ability to work with prime-related mathematics.
Tips for Finding Primes Under 50
- Memorize all 15 primes: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47 - that's your complete target list.
- Remember: 2 is the only even prime: All others are odd, so you're looking for odd numbers in the prime list.
- Spot larger primes first: Numbers like 47, 43, and 41 are distinctive and easier to locate than smaller primes.
What is a primes under 50 number search?
A primes under 50 number search asks you to find all 15 prime numbers below 50 hidden in a grid: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, and 47.
Why start with primes under 50?
With only 15 primes to find, this is the most manageable prime number puzzle. It introduces the concept of primality without overwhelming beginners with a long target list.
How can I teach primes using this puzzle?
Have students list the primes under 50 first, then use the puzzle to reinforce recognition. After completing the grid, discuss which numbers are most often confused with primes (like 9, 15, or 21).